http://psychcentral.com/news/2011/09/21/cognitive-style-tends-to-predict-religious-conviction/29646.html

Participants who gave intuitive answers to all three problems [that required reflective thinking rather than intuitive] were one and a half times as likely to report they were convinced of God’s existence as those who answered all of the questions correctly.

Importantly, researchers discovered the association between thinking styles and religious beliefs were not tied to the participants’ thinking ability or IQ.

participants who wrote about a successful intuitive experience were more likely to report they were convinced of God’s existence than those who wrote about a successful reflective experience.

I think this is the source but I can't be sure:

http://www.apa.org/pubs/journals/releases/xge-ofp-shenhav.pdf

http://lesswrong.com/lw/7o4/atheism_autism_spectrum/4vbc

Reddit /r/psychology discussion