What is the function of religion?

[Hegel]

I don't deny that religion can be beneficial in some aspects. It does, however, cause a whole host of other problems by allowing people to live in denial rather than embrace reality, which completely outweigh any positive benefits.

But what if there are aspects of reality that religion makes it easier to accept as real?

And one can live in delusions without religion.

But don't misunderstood: I am not particularly fond of religion ...

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If every society has been religious, on what basis do you then claim that religion makes a society fitter?

On the basis that non-religious societies have been the losers in the game of survival of the fittest between societies.

That's the hypothesis.