I read this AMAZING book over the course of the past week. I've been wanting to read it for months, but school got in the way.
It expands on the documentary "Root of All Evil?" that Dawkins made for British television. I highly recommend the documentary as well. Unfortunately it is no longer available on Youtube, but it is still on Google video. (Just search for Dawkins, it is bound to turn up in the first few results!)
Dawkins doesn't use the stinging rhetoric of Christopher Hitchens (See my other thread), but he does include a lot more science, from the origin of the universe, to the origins of life, to evolution and natural selection, to the grand, unifying theory of biology (namely, Darwinism).
Some (but by no means all) the points he raises, and especially ones that have given me much food for thought, are:
1. Religion is treated with such deference and respect. Why is that? Why are we supposed to defer to the opinions and prejudices of men (never women) whose only schooling is in ancient books written in the deserts of Judea and Arabia? Why, in the name of 'multiculturalism,' do Muslim religious leaders, unelected so-called 'community leaders,' get to speak for their communities on all matters?
2. Religion cannot, does not, and ought not to dictate our morality. Letting religion completely overwhelm our own innate sense of right and wrong leads to such sickening evil as suicide bombers.
3. Religion cannot explain to us the origins of the universe, the origins of life, the evolution of life, or the fate of the universe. To sneak religion into life science classes (under the guise of creationism, or that misnomer 'intelligent design') is madness, like teaching alchemy in chemistry class, or astrology instead of proper astronomy.
4. Religion requires the suspension of reason. What else can lead millions of poor people to send every last cent to millionaires who go on TV and ask everyone to send them their money? And what else can lead otherwise sane, sometimes educated individuals to commit carnage, particularly suicide bombings?
There's much, much more. Read the book. Whatever your stance on the issue, you'll be glad you did!