Here are my comments posted at the other blogs:
The 1975 Carnegie Foundation National Survey of Higher Education revealed the same basic facts, especially that academics are twice as likely to be atheists. It also revealed that atheism is highest among social scientists, whereas "hard" scientists to not exhibit higher than average levels of atheism. I figure there are four ways to explain this:
1) Academics lack exposure to the business world, and are less moral because of it. Sounds harsh, but this is Adam Smith's idea.
2) Also from Adam Smith, academics are prone to group-think, and produce sciences which are "a mere useless and pedantick heap of sophistry and nonsense." Here, the bad science is the secularization thesis, which has dominated the study of religion for 100 years.
3) Academics seek fame more than fortune, and this is at odds with Christian theology.
4) Academics seek to persuade and influence society, partly because their minority views put them at a disadvantage. This applies to atheism as well as extreme political views.
I do find support for all of these. Let me know if you'd like to see the paper.
Addendum: More from Arnold Kling, and my posted comment:
I don't doubt there is a certain degree of socialization going on, but I still think selection explains most of it. If I'm recalling correctly, this is supported by Wuthnow's article "Science and the sacred" found in "The sacred in a secular age" edited by Phillip Hammond.
I'm going to go check that out again myself. There's a lot of good research on this summarized in that article.