Here is a wonderful documentary by evolutionary biologist Richard Dawkins on the dangers of religion:
http://throwawayyourtv.com/2006/06/r...cumentary.html
Note that Dawkins did not choose the title. He wanted it to be called something else, since obviously nothing is the root of all evil, but the producers wouldn't budge. The only concession to his disagreement was the addition of a question mark. Nevertheless, it is a good exposé of the significant amount of evil posed by irrational faith in ancient scriptures and unproven gods.