Why did Christians score so low on this religious literacy survey?

article: http://news.yahoo.com/s/ap/us_rel_religious_literacy_poll
atheists and agnostics averaged 21/32 correct answers, and Jews and Mormons averaged 20/32.
Christians were way down at around 16/32 correct.

Why do Christians score so much lower than atheists, agnostics, Jews, and Mormons?
 
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