>When was the turning point where people began to believe the bible to be metaphors rather than literal?
Marcionists lived around 100-500 AD. and believed that the cruzifiction itself was a metaphor.
"Marcion held Jesus to be the son of the Heavenly Father but understood the incarnation in a docetic manner, i.e. that Jesus' body was only an imitation of a material body, and consequently denied Jesus' physical and bodily birth, death, and resurrection."
Then catholics took over and streamlined a lot of things.
Dozens of other important christian heresys came up during that time, many of them rejecting the old testament as a work of impostors at best and as the product of a wrathful demonic entity at worst.
Lotsa trippy shit too, early christians are interesting and weird.