God is not Great, a book by Christopher Hitchens
I'm a non-believer, but I've been wary of anti-religious books by the likes of Richard Dawkins, assuming a certain pomposity and tilting at windmills. I actually feel a bit stupid now. What I thought were windmills really are giants and Hitchens does a devastating job of showing how overwhelmingly destructive they are.
A number of points I think Hitchens is making:
Proponents of religious belief repeatedly offer proofs until all are debunked. At which point they state that the proofs against are irrelevant because the divine does not operate according to the logic of this world, normal human understanding etc.
Religion all over the world repeatedly shows itself to be hostile to the intellect and to the senses, both the evidence of the senses and the pleasure that may be derived through them.
Religion is frequently defended on the grounds that it instills morality and provides comfort, when, in fact, it instills a far from comforting terror of punishment and perpetually creates a veneer of morality for acts and persons that are extremely harmful.
Scientific knowledge, even when described as theoretical, is based on rigorous, peer-reviewed testing and re-testing of the available data. Theories are so described because they may be superceded by new and better information. They are not so described because they are based, as religious beliefs are, on no evidence at all.