alternatehistory.com

In OTL, through out most of our history the population of the world is only 2.3% percent Atheist, or 11.9% Non Religous. What if thoughout human history, there was exactly 50% of the population that was genetically predisposed to being religious, and another 50% of the population that was genetically predisposed to being atheist. How would this effect the evolution of humanity?
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