How do we know that any of history from that era isn't fiction for that matter?
“How do you know the Bible is not fiction?”
Much of it is. Jesus evens states they are parables.
But, since the importance of the Bible is in the ‘concepts’, and not the ‘details’, it doesn’t matter.
What matters is that one finds a way to GOD through what they interpret from the Bible.
All this argument of what the Bible ‘means’ is silly, because God made each person unique, and their ‘understanding’ with God is unique.
All those who try to force their Bible, their interpretation, their religion, their ‘rules’ on anyone else are missing the entire point of the Bible.