A reader writes:
According to the National Longitudinal Study of Youth 1997, the average IQ of Jewish youngsters is 111.3, and Episcopalians 110.3.
Other groups include.
Jews are less than half as likely as the average to join the military, whereas Episcopalians are only slightly below average in enlistments.
Along those lines, here's a 2002 article I wrote on the demographic breakdown of the U.S. armed services personnel based on what religion they choose to have stamped on their dog tags.