In 1997, a study by Edward Larson of the University of Georgia decided to evaluate the religiosity found in the scientific community. In a poll of 400 members of the National Academy of Science, he found that only seven percent expressed a belief in a God. Seventy-two percent expressed "personal disbelief" (atheism), and 20.8 percent expressed "doubt or agnosticism."
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Not up to date, but I'd not argue it's changed much, I have heard of nothing earth-shaking in the last few years that would sway numbers like those.
-Justin