Rebecca Newberger Goldstein's "36 Arguments for the Existence of God". Easily one of my top-10 favorite books ever. Beautifully written and hilarious (a particularly difficult combo for an author to pull of, IMO), a non-linear, recursive loop through the lives of several atheist characters who are inextricably tied to religion in one way or another. The author has quite an interesting life history: philosopher, biographer of Gödel and Spinoza, famous novelist, currently married to Stephen Pinker, among other things.