Do Christians and Muslims refer to the same God? Are they worshiping the same being? Or are the followers of Muhammed – as some Christians hold – rallying behind nothing more than an idol of their own making?
These are questions that arise (better: erupt) from time to time, often cohabiting with a raft of political issues concerning the contested place of Muslims in modern Western societies. Their intermingling means that one’s answers tend to be governed, not by considered analysis of the relevant data, but by tribal affiliation. The subservience of open enquiry doesn’t augur well for the successful pursuit of truth; as previous debates have demonstrated, such efforts are often hamstrung when pre-fabricated narratives or partisan scripts are substituted for genuine, critical reflection.
If truth exists at all in this debate, then it is likely to lie in the relatively austere domains of philosophy and theology. This doesn’t mean the questions are thereby rendered straightforward; even shorn of their inevitable political accretions, they remain far more vexing than many people recognize. Had I myself been asked these questions several years ago, I would have considered the answers absurdly self-evident: Christians and Muslims are most certainly not in contact with the same God, whether referentially or by means of (attempted) worship; above all, I would have argued that the doctrine of the Trinity presents an insuperable theological barrier to harmonisation.
The passage of time, however, has led to a certain mellowing. Whilst I hesitate to reject my earlier position entirely, I think the subject demands a response that navigates the relevant issues in a more discrete, nuanced – even tentative – manner. It is precisely this kind of approach that I shall adopt in the following post, as I engage in a somewhat recursive conversation with those who have applied themselves to the matter. Where partisan loyalties have frustrated past debates, philosophical and theological reflection can encourage precisely the kind of intellectual sobriety that is so often lacking.
One quick caveat before moving on. Throughout this essay, I will be focusing primarily on the concept of reference, as opposed to the richer, more layered activity associated with worship. I regard those as distinct (yet deeply related and overlapping) acts: simply referring to something is not necessarily the same, of course, as venerating it. Even so, worship logically requires the success of denotation, and is in fact a subset of that broader intentional category. Many people in these debates have simply jumped to the question of worship without first considering the prior question of reference. I think it important to prise them apart, in order to avoid unnecessary conflation and confusion. As such, I shall focus on the fundamental issue of reference; time permitting, I will reserve further comments on worship and veneration for a separate post.
Sense and reference
Let’s begin with a common point of discussion. In the course of past debates, people of a more philosophical bent have often reached for the semantic distinction between sense and reference as a way of understanding how Christians and Muslims might well be referring to the same God. First enunciated by the German philosopher, Gottlob Frege, it’s the idea that two or more people can refer to the same object, even if they do so in contrasting ways; the referent or entity in question may be the same, but the expressions used to “present” it linguistically may differ. A stock example is the way the planet Venus is described as “the morning star” and “the evening star”, depending on the time at which it is viewed. Or, to borrow an analogy from the world of comic books, Superman, Clark Kent, and Kal-El all refer to the same individual, despite differences in designation. Simply using contrasting expressions, therefore, doesn’t automatically entail that the subject of such expressions isn’t one and the same thing.
Proponents of the view that Christians and Muslims refer to the same God would say that something similar obtains here. Even if the followers of Christ and Muhammed describe God differently – “God” and “Allah”, respectively – it doesn’t necessarily follow that they aren’t at least referring to the same deity. As the Superman example demonstrates, it’s possible for descriptions of an object to differ in sense, without demanding a corresponding distinction in reference. A difference in linguistic expression is, in other words, logically compatible with sameness of referent. As the yea-sayers might argue, Muslims and Christians are talking fundamentally about the same being, despite certain terminological differences; “Allah” and “God” (or “Yahweh”) are, on this view, different designations for what is the one entity.
All this is true, so far as it goes. But as the philosopher, Bill Vallicella, observes, whilst a difference in sense is logically consistent with sameness of reference, it’s also consistent with substantial difference: Cassius Clay and Muhammed Ali are the same person; Barack Obama and Justin Trudeau, by contrast, are not. Vallicella also notes, by way of his own example, that sufficiently large differences in sense can create a cumulative difference in reference. Say two people use “God” to describe their respective conceptualisations of the deity. The first person uses his chosen label to denote a transcendent, necessary being who created everything distinct from himself, and preserves the entire panoply of existent reality at every moment. The second person, by contrast, uses his preferred designation to refer to a contingent being who exists within the space-time universe, and who fashioned our world out of pre-existing matter – a kind of Platonic demiurge, as it were. As Vallicella rightly avers, a being cannot be both contingent and necessary; as such, the people in this analogy cannot be said to be referring to the same entity.
This wouldn’t, by itself, provide warrant for the sceptic (although I’m not suggesting that Vallicella is necessarily arguing in this direction). It leaves unsaid just what differences are required for a distinction in linguistic presentation to lead to a corresponding divergence of referents. In the example cited above, the differences are so great and so obvious – i.e., the respective natures of the entities in question are fundamentally incompatible – that one can be justified in saying that the two interlocutors part ways in their objects of reference. By contrast, whilst Christians and Muslims differ on some important aspects of their respective understandings of God/Allah, adherents to these religions espouse a basic monotheism that is similar in key respects (transcendence, sovereignty, eternality, immateriality, etc.). The analogy, therefore, may not have quite the same force if applied to the question at hand, precisely because the contingent-necessary/transcendent-immanent distinctions alluded to earlier do not obtain here (I’ll return to the issue of shared monotheism simpliciter, and whether it provides warrant for saying Christians and Muslims refer to the same God).
Nevertheless, I think Vallicella’s essential point is valid: the sense-reference distinction doesn’t actually get one very far. At best, it might compel someone to migrate from occupying a negative position on the question, to a form of agnosticism.
Assessing some common analogies
As the last analogy above demonstrates, it’s sometimes the case that two (or more) individuals can refer to what is putatively the same object, only to find that their respective beliefs diverge so widely that sameness of referent is simply impossible. But some argue that even where one person’s understanding conflicts with another’s, both parties may nonetheless enjoy a shared object of reference. The philosopher, Francis Beckwith, has argued in just such a fashion. He offers as an example a scenario in which two women, Lois Lane and Lana Lang, are both infatuated with Superman. Lois correctly believes Superman to be a native Kryptonian, whilst Lana erroneously thinks he is a native Kansan, born to his human parents, Martha and Jonathan Kent. Beckwith goes on to assert that even though Lois’ and Lana’s beliefs about Superman are incompatible, and even though Lana holds incorrect beliefs about the object of her affections, they nonetheless refer to one and the same individual.
A similar example (deployed by the philosopher, Edward Feser) concerns a sharply-dressed man drinking from a Martini glass at a soiree. One person, spying the man from across the room, incorrectly thinks he is drinking a Martini. A second person, however, rightly believes him to be drinking only water. However, it is still the case that both people are referring to the same gentleman, despite holding incompatible beliefs about him (i.e., the contents of his drink), and despite one person being wrong about certain of the man’s properties. Proponents go on to say that although Muslims hold what Christians regard as erroneous beliefs about God, they – like the person who thinks the dapper gent is drinking a Martini – are successfully referring to the same entity.
What to make of these analogies? Do they successfully establish the point that claimants wish to make? I have my doubts. I agree with Lydia McGrew that they are question-begging, for they assume what they are meant to prove. That is, the analogies rest on the presumption that Christians and Muslims are referring to the same God, and reason from there. Take Beckwith’s example first: without the prior supposition that Lana and Lois are both referring to the same man, the analogy loses its force. Within the context of the fictional world created by DC, both women are in touch with Superman, having become acquainted with him personally. We can therefore say that despite incompatible – and indeed, erroneous – beliefs, they are connected to the same person. But the question as to whether Christians and Muslims are somehow in touch with the same deity is precisely what is at issue, being the axis upon which the entire debate turns.
Moreover, as readers, we occupy a privileged vantage point, which allows us to say that Lana and Lois are indeed referring to the same man. But the same does not apply in the case of God’s identity, for we are all ensconced within the epistemological limits of finite existence – such that the “bird’s-eye” view possible in Beckwith’s Superman analogy is entirely precluded here. The same kind of shared perceptual certainty doesn’t obtain in the case of Christians, Muslims, and God, largely because the ontological status of Superman (again, within the confines of the fictional narrative) is quite different from that of the transcendent Creator. As McGrew rightly notes, the analogy only shows that there are certain times when two people can have diametrically opposing views about an object, and yet still refer successfully to one and the same thing. It establishes nothing more than that.
The same problem afflicts Feser’s “dapper man” analogy. If you and I are looking at the same person at a party, then our external senses allow us to detect, or “lock onto”, a common physical object. This would be so, despite our conflicting beliefs regarding the contents of his Martini glass. Moreover, because of our shared perceptual “grasp” of the man in question, we are able to confirm that conclusion through other forms of publicly-available sense data (e.g., that he’s speaking to a woman in a red dress, that he has a white flower attached to his lapel, that he has a pencil moustache, and so on). But how, I ask, can we do this of God? He is not an object of the senses like the smartly-dressed man, just as he isn’t an object of the senses like Superman is in relation to Lois and Lana. As I observed a moment earlier, his ontological status means that he is not susceptible to perceptual detection; there are no shared sense data to which people can appeal in order to determine whether or not they are successfully referring to him. On the assumption that God exists, his nature is such that he utterly eludes our ability to perceive him with the senses. Whereas men of a certain sartorial cut are denizens of the material order, God is the very foundation of that order. Cognate with this status is his complete transcendence over physical reality, and thus his essential immateriality – qualities that explain why he is not susceptible to detection using one’s normal perceptual apparatus.
As Bill Vallicella observes, “we are not acquainted with God” (where knowledge by acquaintance is being used in a technical sense, to distinguish it from knowledge by description). In the absence of other forms of knowing – e.g., mystical experience of some kind – “we are”, he says, “thrown back upon our concepts of God”. And those concepts cannot be anchored in the same way that shared sense data can, particularly as some of the core aspects of this debate – the most prominent being God’s supposedly triune nature – are believed to be revealed truths. This isn’t to say that Muslims and Christians aren’t successfully referring to the same God; that would represent a certain hastiness in one’s logic. But it is to say that analogies like Feser’s fall short of establishing his case, precisely because of crucial disanalogies between well-dressed men and God.
Allusion to the Christian belief in God’s triunity brings me to another important difference between Feser’s analogy and the issue at hand. Whether a certain man at a party is drinking a Martini or water is of little importance where his essential nature is concerned. Feser himself would likely say that this remains an accidental property of the gentleman. As such, incompatible beliefs over the contents of his glass do not significantly impinge (if at all) on questions concerning his nature or identity. If the same man were drinking something else, or even nothing at all, he would still be the same man, and his nature – according to an Aristotelian like Feser – would be that of a rational animal.
But the elements of Feser’s analogy seem to be unlike those of the current debate. For Christians, God’s triunity isn’t some kind of secondary or accidental property, like a Martini glass nursed at a party. Nor it is a metaphysical adjunct or addition to an already-existent monotheism – as if the divine nature could persist apart from its instantiation as a triunity of divine hypostases. On a Christian view, the Trinity is utterly essential to who God is, such that he does not exist separately from it. Remove his triunity (were that even possible), and you’re not simply left with a radically unitarian deity; metaphysically-speaking, you’re left instead with nothing at all.
In other words, the dispute isn’t over comparatively minor or non-essential properties; they have no bearing on who someone is (even if, under certain circumstances, they may aid identification). Rather, the question hangs on differences that go to the very heart of the divine nature. This might appear to raise the distinct possibility that Christians and Muslims aren’t merely quibbling over theological details; rather, they may well be referring to different things entirely when they use the linguistic token “God”. Of course, I am not quite saying that members of these religions certainly aren’t referring to the same God. But I am led to roughly the same conclusion that I was before: Feser’s analogy provides insufficient grounds to argue that they are.
The Trinity: an insurmountable obstacle?
I want to linger on the Trinity a little longer, for whether the doctrine prevents Muslims and Christians from referring to the same God invariably underlies competing positions. Driven by their uncompromising belief in Tawhid, or God’s unitary nature, Muslims utterly reject the idea of the Trinity as a lapse into polytheism. On the other side of the divide, a number of (usually conservative) Christian commentators are convinced that anyone who denies God’s triune being cannot legitimately be denoting the same deity as orthodox followers of Christ. Talk of sense and reference, or of analogies intended to suggest identity of denotation (despite diverging beliefs about the object in question) is ultimately irrelevant: God’s triunity, according to some, makes it obvious that Christians and Muslims are treading completely unrelated paths in their conceptions of God.
Commenting on the issue, Bruce McCormack, a theologian at Yale, sketched a possible case for why Christians and Muslims do not worship – or indeed, refer to – the same God, building that case on the bedrock of Trinitarian conceptions of God’s nature (note well that this isn’t McCormack’s personal opinion). In his essay, McCormack rightly observes that on a Christian view, God is essentially triune. The concept of the Trinity cannot be arrived at simply by adding “three-ness” to a prior commitment to divine oneness. For the follower of Christ, triunity is woven into his very being. It isn’t a kind of “fourth” quality in which the members of the godhead participate (as three human beings might be said to “participate” in a common human nature distinct from any one of them). Again, the Christian God is constituted by his tri-personal nature. All of this is to say that anyone breezily claiming that Christians and Muslims do indeed refer to the same God needs to reckon with the possible implications of what Christians regard as God’s radical, thoroughgoing trinitarian character.
It might seem, then, that Muslims – who adhere to God’s absolute oneness – and Christians do not refer to the same God, given they hold antithetical doctrines about him. McCormack’s comments on what exactly it means for God to be triune appear simply to deepen that divide. Similarly, Bill Vallicella has objected that one being cannot satisfy both triunity and non-triunity – meaning that a Christian and a Muslim cannot, in his view, be directing their beliefs and intentional states towards the same entity. Whilst Vallicella may be more circumspect than others, he appears to be fairly settled in his view that Muslims fail to refer to any extralinguistic entity.
However, there are three reasons why I am not quite satisfied. In fact, they may even provide grounds for saying that Christians and Muslims, for all their key differences, ultimately do refer to the same God.
Metaphysics, logic, and God’s triunity
First, whilst God’s triune nature is for Christians an inescapable part of who he is, it’s also the case that one can make a logical (as opposed to metaphysical) distinction between this and his basic unity. Indeed, the fact that many of the early Christians held to monarchical views of God suggests as much (to say nothing of contemporary Christians, who are likely to adhere to a de facto Monarchianism. Are they, too, referring to a different God?). What I mean is that despite the importance of the doctrine – and behind that, God’s essentially trinitarian being – it remains possible to logically distinguish God’s “three-ness” and his oneness. To put the point in a slightly different way, monotheism is logically prior to trinitarianism; one must first have a concept of God’s fundamental unity, uniqueness, transcendence, etc., before one can then conceive of the Trinity. If one can logically differentiate these two dimensions of God’s nature; and if his unity is the logical predicate for anything else that might be true of him; then it seems possible to be able to refer successfully to him simply by acknowledging the fundamentals of monotheism.
As such, it may be sufficient for Muslims to hold to basic monotheistic beliefs (God as a unity, transcendent, eternal, the creator of everything distinct from himself, etc.), since they alone might allow one to say that both the followers of Muhammed and Christ refer to the same deity. The former may deny the Trinity, to be sure; but because triune depictions of God are logically “contained” within broader, more general conceptions of monotheism – conceptions that are common to both religious systems – successful reference is perhaps possible, even if crucial Christian distinctives are rejected.
This is where Vallicella’s “contradiction” argument, alluded to above, perhaps falls short. Although it is true that no being can be both triune and non-triune, triunity and monotheism are not exhaustively opposed in the same way that other polarities are. A number cannot be both odd and even, for oddness logically banishes its opposite. Similarly, contingency and necessity, to which I referred earlier, are mutually exclusive. But whilst contingency excludes necessity (and visa-versa), triunity and monotheism don’t cancel each other out in the relevant way. Once again, trinitarian conceptions of God build on basic monotheism; they may be woefully incomplete on a Christian reading, but they don’t thereby preclude the possibility of additional theological constructions along trinitarian lines. On the other hand, there is simply no sense to be made of the notions that (e.g.) an odd number is built upon the basic idea of evenness, or that a being’s contingency might be grounded in necessity.
Distinguishing God in himself and our knowledge of him
The second observation bleeds into the first, having been suggested by the fact that one can logically distinguish between God’s unity (part of basic monotheism) and his trinitarian nature. Such distinctions allow a person to develop concepts regarding the former without determining the plausibility of the latter. There seems to be a logical difference, then, between God as he is and the way we might conceptualize him. Edward Feser asks us to consider a scenario whereby God is essentially triune, but never undertook any of the actions that Christians attribute to him (the election of Israel, the incarnation of Christ, the founding of the church, revealing himself as a trinity of divine persons, etc.). Feser rightly argues that all of this is metaphysically possible even though God would remain a trinity. People would only know God in a bare monotheistic sense, but the de-coupling of religious epistemology from God’s nature ad intra implies that this would not prevent them from successfully referring to him. It shows that whilst God is, of metaphysical necessity, triune (at least according to Christians), one can still conceive of him apart from that triunity; the Trinity may entail something vital about God’s being, but it does not entail that “we cannot conceptualize” him in non-trinitarian terms. To think otherwise, Feser notes, is to confuse epistemology and metaphysics.
The Jewish experience
My third and final point acts as something of a real-world proving ground for the above theoretical observations. It concerns the key question of Jewish understandings of God. As several commentators have observed, the experience of the Jewish people tends to undercut the claim that the Trinity ultimately separates Muslims and Christians in their references to God. For Jews, just as much as Muslims, deny that God is a trinity of persons. Those who are quick to say that Muslims refer to a different “God” as a result of their rejection of the doctrine are also likely to insist that this doesn’t present a barrier to successful reference in the case of Jews. But if both sets of religious believers adhere to a radically unitarian view of God, why is it only Muslims that are said to fail in their attempted references? Some have argued the “genetic” link between the Jewish religion and the sect that eventually became Christianity is enough to ensure identity of reference: because observant Jews follow Yahweh as depicted in the Old Testament, then they are referring to the God whom Christians believe revealed himself climactically in the person of Jesus Christ. Lydia McGrew makes this observation, and suggests that there is a fundamental “asymmetry” between Judaism and Islam at precisely this point: whilst the God in whom Jews believe chose the children of Abraham and established a covenant relationship with them, no such relationship exists between him and Muslims.
This is certainly true, but I’m not sure how germane it is to the debate. If it’s the case that a rejection of the Trinity means that one fails to refer to the same God as Christians, then I don’t know why Jews and Muslims ought to be considered differently – Abrahamic covenants notwithstanding. As far as I can see, either the Trinity is essential for reference, or it isn’t. If a Jewish person denies the Trinity, and acceptance of that doctrine is (as proponents hold) necessary for successful denotation, how does Yahweh’s historic pact with Abraham change such a state of affairs? Rejection of the Trinity, on this view, surely entails failure of reference, regardless of other considerations. I myself can’t help but think that the limiting principle of God’s triunity is being inconsistently applied.
Of course, McGrew does admit that in a sense, Jews and Christians “worship” (her word) different gods, precisely because of differences concerning the Trinity. But she maintains that the historic link between Judaism and Christianity entails a certain commonality of reference. Now, Muslims traditionally believe that God acted in the way the Old Testament describes, just as Jews and Christians do. They also believe, of course, that God revealed himself climactically to Muhammed, which both Christians and Jews deny. McGrew says that this, along with a categorical rejection of the Trinity, is enough to sever any lingering connection they might have with the one, true God.
I am inclined to think that McGrew over-extends herself at this point. Again, if modern-day Jews can still successfully refer to God, despite denying what Christians see as his essential nature, why not Muslims? A more proportionate view of the situation might acknowledge the grave deficiencies contained in Muslim conceptions of God (in regards to both his actions and his nature), without thereby taking the further step of suggesting that followers of Muhammed fail to stand in referential relationship with the same God as Christians. Although the Trinity is, from a Christian point of view, essential to God’s being, there is still a distinction between mistaken – even “deeply mistaken” – beliefs about the one true God, and referring to another deity altogether.
Are overlapping beliefs relevant?
It’s true that some have argued that the kind of position I have just sketched inevitably leads to a diluted or “generic” form of monotheism. Bill Vallicella seems to suggest that the overlap between Christians and Muslims – something he cheerfully admits – is a mere abstraction, and doesn’t actually refer to the concrete, determinate deity in question. An analogy might help to flesh this idea out a little more. It’s possible for two people to refer to the abstract idea of the President of the United States via a description of his powers and constitutional responsibilities, all while failing to denote the same, concrete individual. There may be some generic overlap between their respective descriptions, even if the first person is actually referring to Abraham Lincoln, whilst the second person is referring to, say, Richard Nixon. In similar fashion, Christians and Muslims may well share some common assumptions regarding God’s nature, but divergences concerning his triunity (so the argument might go) entail nothing more than reference to an attenuated concept.
I don’t want to dismiss Vallicella’s objection entirely, but once again, I am drawn to the notion that the logical distinction between monotheism simpliciter and its trinitarian sub-species implies that one can successfully refer to God, even if he should fall short of a complete account of the deity. The analogy I have used draws on something of which there have been multiple instantiations, for there have been many presidents since the founding of the United States. Christians and Muslims, however, coincide in their belief that only one God exists to whom they both claim to refer. In the case of American commanders-in-chief, it’s possible to distinguish between an abstracted notion of “President of the United States” and the particular men who have fulfilled that role. I don’t think the same is true here: unlike the office of the President and the distinct individuals who have occupied it, God’s “whatness” is, on a monotheistic view, identical with who he is. In fact, given the radical uniqueness Christians and Muslims (as well as Jews) ascribe to God – which means he cannot be a “member” of a genus, or an instantiation of a general type – I think it well-nigh impossible to find a comparable analogy.
Despite significant differences concerning aspects of God’s nature, Christians and Muslims still maintain a series of shared beliefs: that the deity is utterly distinct from all else; that he is the transcendent, self-sustaining creator of everything; that he is the ultimate source for all things; and so forth. Whilst for Christians, such a depiction is in need of further refinement (given our trinitarianism), it’s accurate as far as it goes. And if it’s true that there is only one deity – i.e., only one metaphysically ultimate being underlying and sustaining all else – then it’s hard to see how Muslims could refer to an abstracted concept that fails to coincide with the concrete particular represented by the appellation “God”. Vallicella writes that the “overlap” between Christ followers and Muslims “is but an abstraction insufficient to determine an identifying reference to a concrete, wholly determinate, particular”. But I would argue that in the case of God, the common ground they occupy is sufficient – precisely because of the monotheistic base to which both religions hold. As Feser has argued, “if someone affirms” the key elements of a (classically) theistic view of God, “then there is at least a strong presumption in favour of the conclusion that he is referring to…the true God”.
Some concluding thoughts
Where does all of this leave me on the question of Muslims, Christians, and the reference to God? It’s perhaps clear that I have moved, ever so tentatively, to the conclusion that adherents from both religions ultimately refer to the same God – and this, despite wide disagreement on some important aspects of his nature and being. As a Christian, I regard the Islamic rejection of the Trinity as deeply erroneous; but notwithstanding the possible significance of God’s essential triunity – a point to which I am not unsympathetic – I think the followers of Muhammed hold to a theological conception that in many crucial respects coincides with a Christian understanding. I don’t think proponents of this view have always mounted the strongest of arguments, and the most common analogies offered fall well short of demonstrating commonality of reference. But on balance, I think that the arguments I have pursued here are probably sufficient to establish the claim that Christians and Muslims are referring to one and the same deity. I would therefore largely agree with the conclusion reached by Reformed theologians, Jeroen de Ridder and Rene van Wondenberg, in their Faith and Philosophy essay:
[The question] doesn’t allow a univocal answer. On the one hand, since belief in the same God requires roughly a certain commitment to the same characterization of God, Jews, Christians, and Muslims do not believe in the same God…On the other hand…the Reformed view can be taken to entail that the word “God” as used in the three religions refers to the same God and, differences notwithstanding, there is certainly striking partial overlap in their characterization of God and his nature.
I should also say that whilst I don’t ultimately share Bill Vallicella’s conclusion on the matter, I agree with him that an obvious answer either way is extremely difficult; apart from anything else, the fact that God is not an object of sense perception means that assessing claims of shared reference are far from straightforward. Moreover, Vallicella is surely correct when he says that people who think otherwise simply haven’t engaged in the arduous process of intellectual and philosophical reflection. It is largely a matter of weighing probabilities, as opposed to tight, logical certainty; of cautiously rendering judgment, based on sincere and genuine engagement with views both consistent and discordant. All participants would do well to bear such advice in mind.
 Of course, not all accidental properties are so unimportant where the question of successful reference is concerned. For example, skin colour could be seen as an accidental property, in that the amount of melanin a person possesses has no bearing on his essential humanity. But imagine if we were talking about a certain individual, someone I believed was white and you believed was black. In that instance, it’s harder to see how we could be referring to the same person.
 Unfortunately, McCormack’s essay no longer appears to be available online. My references in this blog post are taken from handwritten notes I made before his piece vanished. You’ll have to trust me that I have faithfully rendered his views! For excerpts and a summary of McCormack’s piece, see this entry at the Faith and Theology blogsite (now defunct).
 Drawing such distinctions between various aspect of God’s nature is, of course, different from saying that those aspects are metaphysically distinct (and therefore theoretically separable). This means that there is no conflict between what I said before, concerning the constitutional nature of God’s triunity, and what I argue in the present paragraph.
 Although McGrew discusses the issue in terms of worship, her TGC essay seems to imply that Christians and Muslims do not even refer to the same deity.
 This is different from Michael Rea’s “one God” argument that Christians and Muslims refer to, and even worship, the same being. If I understand Rea correctly, he suggests that because Christians and Muslims both maintain that there is one God, they are logically referring to the same entity. He writes: “Christians and Muslims have very different beliefs about God; but they agree on this much: there is exactly one God. This common point of agreement is logically equivalent to thesis that all Gods are the same God. In other words, everyone who worships a God worships the same God, no matter how different their views about God might be.”
This seems to me to be incorrect. Surely there are some views about God that should make us think that two people have failed to refer to the same being. For example, how can it be that a devotee of Baruch Spinoza (who essentially held to a form of pantheism) and a conservative Muslim are referring to one and the same entity when their beliefs are so radically different? Or, to use a slightly silly example, we might imagine someone who says that there is only one God and that he is Al Pacino. How is it the case, then, that the Pacino worshiper and an orthodox Christian are in touch with the same deity? One believes that a person of flesh and blood, who is material, in time, and subject to change is God; the other, however, believes in a God who is the creator of everything distinct from himself, the unsourced cause of all there is, timeless, self-sufficient, etc. These two conceptions of deity are fundamentally at odds, yet on Rea’s view, we’d have to say that both adherents are in referential relationship with the same God. I submit that Rea’s minimalist criterion is simply insufficient for what he wants to claim – and, moreover, an example of logical haste.
By contrast, my argument rests on the understanding that because Muslims and Christians affirm key, overlapping beliefs about God, and because they also insist that this God is one, unique, etc., then it’s difficult to see how they could be referring to different instantiations of the same category (i.e., “god-ness” or divinity). This is much more specific than Rea’s rather elastic argument, resting as it does on those distinguishing convictions that Muslims and Christians share.