Books for an Atheist?

I recommend the Bhagavad Gita, one of the more important Hindu texts. The recent translation by Stephen Mitchell is pretty good. As for Christianity, perhaps G. K. Chesterton ("Orthodoxy", for instance), although old standbys like St. Augustine and Thomas Aquinas can't hurt. Milton's "Paradise Lost" and Dante's "Inferno" are also interesting and thought-provoking reads, especially the former. If you're looking for confirmation of the nonexistence of God (or at least, confirmation that, if there is a divine being, he isn't benevolent), I second the other answerer's recommendations, because surely a benevolent God wouldn't inflict Stephenie Meyer on the human race.