>to me that doesn't really matter. whether religions are of divine origin or a fantasy, they clearly have a strong influence on the world, and therefore we must subject them to criticism and to reform if they want to keep their relevance in the world.

Why do they need to stay relevant? If you're willing to accept they're fantasy, then it'd be better for everyone to read Lord of the Rings instead. At least it actually promotes wholesome values and thinking, unlike the Bible which promotes rape, slavery, and genocide. The god of LotR is consistent, whereas the god of the Bible seems to be narcissistic, sociopathic, and worse, schizophrenic (somehow going from directing his followers to commit genocide, to later reproducing somehow and then promoting peace and tolerace, but only sometimes).

And at least with fantasy epics, everyone knows they're not real, so no one is setting up theocracies based on their interpretations of them and committing atrocities to support these.