Pew Research Center, Mormons, Jews, and atheists top the list of those who know the most about religion. This is not particularly shocking, of course. Most atheists were raised in a religious home, and lost their faith later in life. Many studied their religion, and in the process, realized that it made no sense, so they gave it up. There has been a lot of blather on the blogosphere lately that atheist do not know enough about religion to criticise it, but this report shows that the average atheist knows more about religion than the average christian.
Besides, it doesn't take all that much schooling to realize that the story of a travelling preacher nailed to a cross coming back to life after three days is rather silly.