Faith is a sexually transmitted disease
It would also seem that religion does best when it has some control of sexuality, and therefore piggybacks itself on evolution, much like a virus. As only those who follow the religion are able to mate. Therefore more genes for "faith" (or good pretending to have faith) get passed on.
When different religions meet with each other they have a built in desire to dominate the area and remove the followers of the competing religion (those that don't tend to die out, or go into hiding) to make sure only their followers get to mate and pass on the religion.
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