Research in the other direction:

http://www.atheismresource.com/2010/atheist-dont-commit-as-m...

http://moses.creighton.edu/JRS/2005/2005-11.pdf

http://seattle.cbslocal.com/2012/06/22/study-finds-people-wh...

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjourna...