While this is not in response to me, I want to use to highlight my point or to ask a question in case I'm completely mistaken.
From what I know, 50ish CE is about as early as we get for dating anything from the NT.
1 Corinthians was written by whom? If it's Paul, and Paul's writing, as you've stated, predates even Mark, which is the earliest of the gospels, then isn't it fair to conclude that Paul's theology had an impact on the writing on the gospels, and thus an impact on the entire story-telling process of the New Testament?
That's the point I was trying to make earlier, albeit in a round-a-bout way. If you removed Paul's theology/writing/influence from the Net Testament, then Christianity looks entirely different, does it not?