Importantly, researchers discovered the association between thinking styles and religious beliefs were not tied to the participants’ thinking ability or IQ.
I thought there is a negative correlation between Religiosity and IQ?
Presumably the study showed that the analytic thinking effect was independent of the IQ effect; i.e. holding the level of IQ constant, one still sees the connection between analytic versus intuitive thinking and religiosity, versus a correlation between IQ and analytic thinking causing the entire effect to be the same. (I haven't read the study this is just what I interpreted that quote to mean)
http://psychcentral.com/news/2011/09/21/cognitive-style-tends-to-predict-religious-conviction/29646.html
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