First up, there's the pew forum report on General Knowledge of Religion in America. Atheists, Agnostics, Jews and Mormons scored the highest, while Bible belt Christians scored the Lowest.

http://pewforum.org/Other-Beliefs-and-Practices/U-S-Religious-Knowledge-Survey.aspx

Then, when asked what's the difference between the way Baptists baptise and how Lutherans baptise, we decided to take that on... no one called during the show, but someone did call imediately after the show... It just goes to show, a lot of people not only lack knowledge, but know it and are afraid to call us sometimes for fear of embarrassment.