A friend recently put this to me:
The fact is though, that you can't logically prove or disprove the existence of God, at least not in the way that the West accepts logic. In essence, philosophizing ad nauseum about the existence or nonexistence of a deity is useless for that end, and it makes Dawkins and Ward pretty obnoxious.
Keith Ward's book, from last summer, is a a good short book by a professional philosopher and theologian that accepts this basic position (no conclusive proof), but lays out very clearly traditional arguments for theism - his main claim is that theists take mind and not matter as the basis for the universe, and that in doing so they show the weakness of rationalist reductionist materialism.
Ward also discusses the conniptions materialists have got themselves into at the edges of cosmology in order to avoid the design argument.
I have long though think Dawkins and his shoddier co-author, Hitchens, just take cheap shots at religion, about which they know very little, and in fact end up being mirror images of the American Evangelical Christians they take as typical of all.
Karen Armstrong, and I have not been a fan of hers in the past, blasts Dawkins out of the water in her more recent book. She focuses less on specific arguments about God, but looks at what faith and religion have meant in human history. She shows the idea of faith as "assent to propositions" to be far too limiting. So, while Ward takes a traditional philosophical approach, Armstrong takes a broader view of what religious truth means.
In response to my friend above, both Ward and Armstrong would agree that I cannot logically prove the existence of God, just as I cannot prove a mountain view is beautiful, or a poem is great - but they point out that all interesting questions are not answerable by logic.
Ward shows that it can be proven in formal logic, if you accept that God is a possible being, then he must exist. (Anselm's argument as put into modern logic by Richard Swinburne). It is true that this does not affect anyone who denies God is a possible being, but if God is possible, then God must exist.
I think most people would accept God is a possible explanation. What these two books show is that God is both a reasonable explanation.
At least theists don't have to start believing in "multiverses" to have an explanation for why we are, what we are, and why we are.