1. One of the greatest books ever written, Demon Haunted World by Carl Sagan. The rest of Sagan's work are also very rewarding.
2. I will give a heavy second to the recommendation of Guns, Germs, and Steel. Absolutly fantastic book.
3. A good book with an EvC bent is Noah's Flood by Ryan and Pittman.
4. On atheism/secularism, Sam Harris is by far my favorite author.
5. I don't like everything he writes and he is pretty pretentious, but God's Problem by Bart Eherman is a good book on religion and the problem of evil.