Considering the infinite variety of ways to exercise a spiritual practice, and that many (perhaps most?) of them have died out in favor of the dominant religion

Considering the infinite variety of ways to exercise a spiritual practice, and that many (perhaps most?) of them have died out in favor of the dominant religions and spiritual practices that survive today, I'd actually say it's willfully blind to ignore the likely impact of religion on survival and reproduction. It's simple game theory. The religions that survive today outcompeted the others.