She says that it is too important to be left to philosophers. She is right that the debate is important and has practical consequences, although I don't think any of the philosophers who have 'piped up' recently (Beckwith, Tuggy, Feser, Rea, Vallicella, et al.) want to take the debate merely as a point of entry into technical questions about reference and identity.
One of the points McGrew makes is one I have repeatedly made as well, namely, that the sorts of examples proffered by Francis Beckwith, Dale Tuggy, and Edward Feser beg the question. If the question is whether Christians and Muslims worship and refer to the same God, one cannot just assume that they do and then take one's task to be one of explaining how it is possible. Of course it is possible to refer to one and the same thing under different descriptions. But how does that show that in the case before us there is one and the same thing?
Another point that McGrew makes that I have also made is that one cannot show that the Christian and Muslim God are the same because their respective conceptions significantly overlap. No doubt they do: for both religions there is exactly one God, transcendent of his creation, who is himself uncreated, etc. But the overlap is insufficient to show numerical identity because of the highly important differences. Could one reasonably claim that classical theists and Spinozists worship the same God? I don't think so. The difference in attributes is too great. The reasonable thing to say is that if classical theism is true, then Spinozists worship a nonexistent God. Similarly, the difference between a triune God who entered the material realm to share our life and misery for our salvation and a non-triune God whose radical transcendence renders Incarnation impossible is such a huge difference that it is reasonable to take it as showing that the Christian and Muslim Gods cannot be the same.
McGrew and I also agree in rejecting what I will call the 'symmetry argument': since Jews and Christian worship the same God, the Christians and Muslims also worship the same God. It doesn't follow. Roughly, the Christian revelation does not contradict the Jewish revelation on the matter of the Trinity, since the Jews took no stand on this question before the time of Jesus. The Christian revelation supplements the Jewish revelation. The Islamic 'revelation,' however, contradicts the Christian one by explicitly specifying that God cannot be triune and must be disincarnate.
McGrew is certainly right that the 'same God' question ". . . can’t be decided by a flick of the philosophical wrist." And this needed to be said. Where I may be differing from her, though, is that on my view a really satisfactory resolution of the questions cannot be achieved unless and until we achieve real clarity about the underlying questions about reference, identity, existence, property-possession, and so on. It is highly unlikely, however, that these questions will ever be answered to the satisfaction of all competent practioners.
Where does this leave the ordinary Christian believer? Should he accept the same God thesis? It is not clear to me that he needs to take any position on it at all. But if he feels the need to take a stand, I say to him that he can rest assured that his non-acceptance of it is rationally justifiable.
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