Tarski wrote:There is a well known adage: A theory that explains everything explains nothing.
I am anxious to find out why Swinburne's God is not just such a theory:Theism claims that every other object which exists is caused to exist and kept in existence by just one substance, God. And it claims that every property which every substance has is due to God causing or permitting it to exist. It is a hallmark of a simple explanation to postulate few causes. There could in this respect be no simpler explanation and one which postulated only one cause. Theism is simpler than polytheism. And theism postulates for its one cause, a person [with] infinite power [God can do anything logically possible], infinite knowledge [God knows everything logically possible to know], and infinite freedom.
My sarcastic theory: Everything that needs an explanation is ultimately explained by The Super Explanans. It is utterly simple and need no explanation (by definition) and just has the unanalyzable fauculty to explain and be the cause for everything. All things are explained now. Let's party.
If that how theists are using God then I would agree with you, it explains nothing in any meaningful sense. Might as well posit an infinite multiverse where everything that can possibly happen does happen. But I think the type of theists we are discussing here do not use God in that way. Christian philosophers and scientists don't write one line books with "God did it" in bold. Modern science would have never even developed in the first place if that was Christianity's attitude to natural philosophy. God is taken as the final end of the explanatory chain for everything in the world and supposedly offers some kind of unifying framework, but that still leaves a whole lot to fill in. If string theory turned out to be some kind of theory of everything there would still be a lot to discover about the details of how our universe works.