fallingblood
Agnostic Theist
We have evidence from quite early on that the early followers of Jesus also believed it to be literal. Those followers were in fact Jewish. By the time that Christianity became its own religion, the idea was firmly there.It could be that the gospel authors knew it was a myth, and Christians took it too literally. After all, someone also wrote a myth of the Buddha being born of a virgin, but it didn't catch on well in Buddhism.