On questions about Christianity – including a battery of questions about the Bible – Mormons (7.9 out of 12 right on average) and white evangelical Protestants (7.3 correct on average) show the highest levels of knowledge. Jews and atheists/agnostics stand out for their knowledge of other world religions, including Islam, Buddhism, Hinduism and Judaism; out of 11 such questions on the survey, Jews answer 7.9 correctly (nearly three better than the national average) and atheists/agnostics answer 7.5 correctly (2.5 better than the national average). Atheists/agnostics and Jews also do particularly well on questions about the role of religion in public life, including a question about what the U.S. Constitution says about religion.
Take the Religious Knowledge quiz from the Pew Forum and compare yourself with the average American! And check out the following video from PBS about the roots of American religious identity: