A Pew research study published in July surveyed almost 11,000 US adults with a series of 32 fact-based, multiple-choice questions about various religions of the world. Pew researchers found that the average American adult could answer fewer than half correctly. They also concluded that most know the answer to basic questions about Christianity, atheism, and Islam, but fewer know about Judaism, Hinduism, or what the Constitution says.

Jews, atheists, and agnostics scored highest, on average answering between 17 and 18.7 questions correctly. Catholics fared worse by comparison (14 right answers), even on questions about their own faith. When asked whether the Catholic Church teaches that the bread and wine of Communion actually become the body and blood of Christ or...

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