The researchers said the educational differences among the faiths were rooted in immigration policies that favor the educated, as well as in political, economic and historical factors.
There were 267 million Christians in the United States when the data was collected, but only 36 percent of them had a postsecondary education, including college or a vocational school, the researchers said. That made them the least-educated religious group in the country.
Jews in the United States were more than twice as likely as Christians to have a postsecondary degree, and Hindus were almost three times as likely, Pew said. Buddhists, Muslims and those who said they were religiously unaffiliated were also more likely to have a college degree than those who identified themselves as Christians.