The Pew Forum on Religion & Public Life has a short, 15 question quiz by which you can compare your religious knowledge with a national poll of randomly selected American adults. Only 1% of the population had the correct answer to all 15 questions. See: http://features.pewforum.org/
References used:
Find a faith group that matches your beliefs: See the Belief System Selector
by SelectSmart.com staff.
Philip M. Parker, "Religious Cultures of the world," (1997).
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