ALL the stories are Man-made.

Show me one, just ONE story that isn't Man-made?

If Man, wrote it down after ages spent recounting it, how is it not Man-made?

Man can say anything he chooses, whether it's true or false is open to question.

If something can be proved beyond doubt, it's true.

If it cannot be proved beyond doubt, believing such a story is a matter of belief/faith.