Biblical authorship is a huge issue all unto itself. Particularly if you are someone that believes the new testament is the word of god. The only sources we have were written 90+ years after the events they describes. It's very likely that Jesus said and did nothing written in the bible. Hell, it's even possible he did not exist as a person (Though, I tend to believe he did, I don't think Christianity would have formed without Jesus existing).

> This is really only a contradiction if you assume that nothing in Bible can itself be metaphorical.

Christianity has this interesting trick where their sacred texts are metaphorical whenever they say something they don't like or impossible. What good is the bible if it's all metaphors yet nobody agrees on which parts are metaphors?