The Bible, composed of the literature of mortal humans, says so. That’s proof enough, LOL!
No, the bible is the inspired word of God. It is "literature" like no other. No one has been able to reproduce anything like it, because they aren't inspired by God to write in the kind of metaphor and divine symbolism unique to the scriptures- God ultimate language, much of which wasn't even understood by the faithful until it was revealed by Jesus. Likewise the unfaithful today can't see and understand it which is why they make silly statements like this. Their lack of faith blinds them.