U.S. Religious Knowledge Survey
I find this bit particularly interesting:
"This survey and previous Pew Forum studies have shown that Jews and atheists/agnostics have high levels of educational attainment on average, which partially explains their performance on the religious knowledge survey. However, even after controlling for levels of education and other key demographic traits (race, age, gender and region), significant differences in religious knowledge persist among adherents of various faith traditions. Atheists/agnostics, Jews and Mormons still have the highest levels of religious knowledge, followed by evangelical Protestants, then those whose religion is nothing in particular, mainline Protestants and Catholics. Atheists/agnostics and Jews stand out for high levels of knowledge about world religions other than Christianity, though they also score at or above the national average on questions about the Bible and Christianity. Holding demographic factors constant, evangelical Protestants outperform most groups (with the exceptions of Mormons and atheists/agnostics) on questions about the Bible and Christianity, but evangelicals fare less well compared with other groups on questions about world religions such as Islam, Buddhism, Hinduism and Judaism. Mormons are the highest-scoring group on questions about the Bible."