I do not believe in any sort of god or other supernatural entities. Before anyone is tempted to ask a series of "Then how do you explain..." questions, I'd like to point out that the burden of proof is on the person making the truth claim (i.e., the theist). The more extraordinary the claim, the more impressive the evidence must be.
Like most atheists, my views are rooted in two observations. First, faith (i.e., belief in something for which there is no evidence and for which contradictory evidence exists) is inherently irrational. Second, religious belief has been and continues to be a force with largely negative effects on humanity.
As far as recommending books, I'll suggest: The End of Faith, The God Delusion, The Jesus Puzzle, and The Demon-Haunted World. For more atheistic book recommendations, see
http://atheistrevolution.blogspot.com/