From the National Bureau of Economic Research:
Two key questions, based on the differences in college experience across majors, are whether either (a) the Scientific worldview or (b) Postmodernism has negative effects on religiosity as these streams of thought are actually transmitted at the college level. The results show a decline in religiosity of students majoring in the social sciences and humanities, but a rise in religiosity for those in education and business. After initial choices, those respondents with high levels of religiosity are more likely to enter college. Of those who are in college, people with high levels of religiosity tend to go into the humanities and education over other majors.
InsideHigherEd has more on the findings.