Bobad, a more recent survey.
Nearly 38 percent of natural scientists -- people in disciplines like physics, chemistry and biology -- said they do not believe in God. Only 31 percent of the social scientists do not believe.

In the new study, Rice University sociologist Elaine Howard Ecklund surveyed 1,646 faculty members at elite research universities, asking 36 questions about belief and spiritual practices.
http://www.msnbc.msn.com/id/8916982/