From the LA Times:

If you want to know about God, you might want to talk to an atheist.

Heresy? Perhaps. But a survey that measured Americans’ knowledge of religion found that atheists and agnostics knew more, on average, than followers of most major faiths. In fact, the gaps in knowledge among some of the faithful may give new meaning to the term “blind faith.”

A majority of Protestants, for instance, couldn’t identify Martin Luther as the driving force behind the Protestant Reformation, according to the survey, released Tuesday by the Pew Forum on Religion & Public Life. Four in 10 Catholics misunderstood the meaning of their church’s central ritual, incorrectly saying that the bread and wine used in Holy Communion are intended to merely symbolize the body and blood of Christ, not actually become them.

Atheists and agnostics — those who believe there is no God or who aren’t sure — were more likely to answer the survey’s questions correctly. Jews and Mormons ranked just below them in the survey’s measurement of religious knowledge — so close as to be statistically tied.

So why would an atheist know more about religion than a Christian?

American atheists and agnostics tend to be people who grew up in a religious tradition and consciously gave it up, often after a great deal of reflection and study, said Alan Cooperman, associate director for research at the Pew Forum.

What always amuses me is when a Christian meets an atheist, and the Christian assumes that the only reason the atheist is an atheist is because the atheist simply isn't knowledgeable about Christ and his teachings.  In my experience, the opposite is true.  Most atheists and agnostics I know have actually read the Bible, cover to cover — an exercise which (in many case) spawned their atheism.  On the other hand, most Christians I know haven't read the Bible in significant detail.