Richard Dawkins, The God Delusion

The remarkable science of ethology, which studies animal behavior, can lead a curious person to very interesting conclusions if one studies the common human belief in God from its point of view. The British biologist Richard Dawkins believes that religiosity has roots that are not heavenly at all, and is only a side effect of another mechanism useful for our species now or in the past. Besides that, he consistently breaks the most common arguments in favor of a religious perception of the world into little bricks, leaving no serious chance to disagree with him on most questions.