Or .
Or ... people show preference to others who share their own beliefs. Granted, I didn't read the study, just this article, so I don't know how they accounted for favoritism.
http://news.discovery.com/history/religion/fear-of-vengeful-gods-may-have-helped-societies-expand-160211.htm
http://news.discovery.com/history/religion/fear-of-vengeful-gods-may-have-helped-societies-expand-160211.htm
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