"Atheists and agnostics, Jews and Mormons are among the highest-scoring groups in a 32-question survey of religious knowledge by the Pew Forum on Religion and Public Life. On average, Americans got 16 of the 32 questions correct. Atheists and agnostics got an average of 20.9 correct answers. Jews (20.5) and Mormons (20.3). Protestants got 16 correct answers on average, while Catholics got 14.7 questions right.
I got 31/32 which makes me smarter on average than all the groups listed.