According to a survey measuring Americans' knowledge of religion. The survey by the Pew Research Center's Forum on Religion & Public Life was done by phone, in both English and Spanish. 3,412 Americans took the survey.
The results don't surprise me. I mean, 1/5 of Americans can't even locate America on a map. What makes you think that Americans would know, say, the preacher who participated in the period of religious activity known as the First Great Awakening?
However, I believe the fact that the survey was given over the phone may have something to do with the poor scores of the people who took the survey. I've taken surveys over the phone before and my first priority was to get them off the phone fastest, not to do well.
But still, some of the results are just embarrassing. 47% of protestants didn't know that Martin Luther inspired the protestant reformation. 88% and 83% of black catholics and white catholics, respectively, did not know that Mother Teresa was Catholic.
Here's the ranking of how well the different religious affiliations did:
Some more stats:
I took the test and got 12/15 and I know jack shit about religion. I only recall two of the questions being hard, the rest were stupid easy. There's no reason to score less than 12/15 and if you do you should feel bad.
Take the test here: http://features.pewforum.org/quiz/us-religious-knowledge/
See if you can do better than the American public.