I read this article about knowledge of religion yesterday and it seems to me that it's probably pretty accurate. If you go through all three parts and the two appendices the impression is of a reasonable approach.
http://pewforum.org/Other-Beliefs-and-Practices/U-S-Religious-Knowledge-Survey.aspx
I think I understand why the atheist know more. What I'd like to know is why everybody knows so little?
http://pewforum.org/Other-Beliefs-and-Practices/U-S-Religious-Knowledge-Survey.aspx
I think I understand why the atheist know more. What I'd like to know is why everybody knows so little?