Also 1/3 of Americans say they read from the Bible once a week and are terrified to read other religious books keeping them inbreed. You know Satan is out to get you in those other books.
From the study:
Atheists and agnostics, Jews and Mormons are among the highest-scoring groups on a new survey of religious knowledge, outperforming evangelical Protestants, mainline Protestants and Catholics on questions about the core teachings, history and leading figures of major world religions.
On average, Americans correctly answer 16 of the 32 religious knowledge questions on the survey by the Pew Research Center’s Forum on Religion & Public Life. Atheists and agnostics average 20.9 correct answers. Jews and Mormons do about as well, averaging 20.5 and 20.3 correct answers, respectively. Protestants as a whole average 16 correct answers; Catholics as a whole, 14.7. Atheists and agnostics, Jews and Mormons perform better than other groups on the survey even after controlling for differing levels of education.
Many Americans are devoted readers of Scripture: More than a third (37%) say they read the Bible or other Holy Scriptures at least once a week, not counting worship services. But Americans as a whole are much less inclined to read other books about religion. Nearly half of Americans who are affiliated with a religion (48%) say they “seldom” or “never” read books (other than Scripture) or visit websites about their own religion, and 70% say they seldom or never read books or visit websites about other religions.