Americans are by all measures a deeply religious people, but they are also profoundly ignorant about religion, according to a new survey. Those who scored the highest were atheists and agnostics, as well as two religious minorities: Jews and Mormons. On average, people who took the survey answered half the questions incorrectly, and many flubbed even questions about their own faith. The results were the same even after the researchers controlled for factors such as age and racial differences. 53: Percentage of Protestants who could not identify Martin Luther as the man who started the Protestant Reformation. 45: Percentage of Catholics who did not know their church teaches that the consecrated bread and wine in holy communion are not merely symbols but actually become the body and blood of Christ.

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