One 2005 twin study [0] found religiosity was approximately 40% genetic. [1] argues that pro-religion alleles are likely to become more common over time, since

One 2005 twin study [0] found religiosity was approximately 40% genetic. [1] argues that pro-religion alleles are likely to become more common over time, since in the contemporary world religious people (on average) have more children than the non-religious It seems unlikely there is any single "God gene". Rather, certain personality traits (such as agreeableness) increase the likelihood of a person accepting religion, and genetics contributes to those traits, which in turn indirectly contributes to religiosity [0] https://pubmed.ncbi.nlm.nih.gov/15745438/ https://pubmed.ncbi.nlm.nih.gov/15745438/ [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3125629/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3125629/