What do you think of this study on religion (details inside)?

I had long suspected this was the case, but a recent study has shown that, at least here in the US, Jews, Atheists, and Agnostics know the most about religion in general, and actually know more about Christianity than many Christians (especially Catholics).

What are your thoughts on the results of this study?

BTW, feel free to take the quiz and see how you do. I got 13 out of 15.