This book is basically the Atheist Bible. Shermer uses evidence from many fields of social science, even from the Bible itself, and statistics of self-proclaimed Christian pollsters to present to us that morality was not of divine influence, but rather evolved just like physical attributions. It's a science text, so most of everything is presented in a concise, well-proven manner.Shermer's second most important point presented to the reader is that religiosity and morality are not hand-in-hand, but rather, as one increases, the other decreases, as he demonstrates using polls from Christian organizations, comparing the divorce rate of athiests and agnostics (14%)and self-proclaimed Christians (17%). He also states that religious people have a higher rate of possessing less-desirable personality traits, such as authoritarianism.For anyone searching for a scientific truth to the human state, look no further than this book.