For sure.

I read some more of Feser's writings. And the more I read, I more I see that the quibble is less about what is and more about what we should call it.

The major thrust of the book is that the proofs show the God exists, hence everyone should be a theist. But you see, the terms God and theist are not defined that well. God, in the context of the book, is an entity that has some qualities that are defined to be something "analogous" to the usual meanings of the word. And that creates a lot of ambiguity in the message. More so because theism is not defined at all.

"The real debate is between theists of different stripes—Jews, Christians, Muslims, Hindus, purely philosophical theists, and so forth—and begins where natural theology leaves off.", the book says. Well here's a thought. Let's take Christians. They necessarily believe that the God revealed in the Bible is True. Moreover, they believe the God of all the other religions are necessarily false [0]. Now of course, as the book itself says, whether Christianity is true or not is outside the scope of the proofs. So for the sake of this discussion, let's say that yes the God the proofs is true (necessarily), but no human religion, including Christianity, is true. That is, God hasn't revealed himself to humans directly. Where does that leave us? Should we still be a theist? A "purely philosophical theist", as the above quote says? What would that mean? What should the beliefs of a theist without any of the current religions be?

In other words, what difference does the presence or absence of this proof of God make in our lives to be able to define us as a theist or an atheist? God may be perfectly good and all knowing and all the rest of the qualities. Alright, so what? Does it have any implication for our lives? At this point I expect the theist to jump in and say (among other things), yes of course it matters. God is the perfect role model, and we imperfect humans should try to elevate our lives to try and match his perfectness. This I think is fine. However, I think this is compatible with being an atheist! Attempting to reach our maximal potential is a valid goal regardless of whether that perfectness is already "actual" or not.

And that is my overall point. That's why I tried to point out the "personal" qualities earlier. When I resist the term theist, for me personally, I am resisting the idea that God is somehow actively participating in the daily affairs of the universe. That He sets the rules for what is good or bad, not as the perfect being, but as defined in the Bible (or other books). That there is a judgement of the our actions and we go to heaven or hell (or cycle of rebirth based on karma, etc). And this later part is I think where most of the disagreement between theism and atheism is. And these later ideas don't (and cannot) come from the proofs. Moreover, there is a subtle flip in the meaning of the terms even when discussing the proofs. For instance, take the first proof. Everything has a (hierarchical) First Cause. Let's call it God. God is the cause of everything. Hence, God causes everything to exist. But you see, there is a flip from the passive "is a cause of" to an active "causes". Which then naturally is taken to mean a God with a will who has the power to cause the universe but also has the capacity to choose to create or not create the universe. And that is I think an unjustified misreading of the words "cause". To make an analogy, electrons "cause" tables to exist, without having any active godly qualities. God can similarly cause and sustain the universe, without having any active role in it.

So yeah, in short, natural theology as described here can actually be compatible with philosophy of science/metaphysics in my reading, and the quibble is more about terms and boundaries. The main challenge for theism is to show the next step, that God revealed Himself to us. Because only that can show that God is personal/active rather than impersonal/passive. And that can only be shown empirically I think, not through philosophical ponderings.

I probably didn't manage to express my thoughts fully, and I hope you'll try to read into the spirit of the message when pondering it.

[0] https://www.quora.com/How-do-believers-of-a-god-defend-this-...