The Religion for Breakfast has some interesting videos on the subject:
https://www.youtube.com/watch?v=4fyI1XOselI - Introduction to Biblical Archaeology
https://www.youtube.com/watch?v=SCy7NuujCLc - How Did the New Testament Form?
https://www.youtube.com/watch?v=yV9VPM7lIoQ - Did the Gospels copy each other?
Also: https://www.youtube.com/watch?v=Z6PrrnhAKFQ - Who Wrote the Bible (Useful Charts)
https://www.youtube.com/watch?v=XKp4yWGTfXo - 10 Changes Made to the Bible (part 1, Trey the Explainer)
https://www.youtube.com/watch?v=kX62bRIG-OI - 10 Changes Made to the Bible (part 2, Trey the Explainer)
In the case of Mormonism, we have tons of other sources from outside the faith, and the claims made by the faithful were largely recorded more-or-less as the supposed events were happening. Our view, and the religion itself, would likely be a ton different if our sources for all that were more like what we have for Jesus and the events of the Gospels. Plausibly, what survived might hardly have any basis in reality whatsoever.
At least those elements of the lore, I believe are constant from the very first followers. A story must have a connecting thread, even though it may have many modifications.
I'm just saying this from a storytelling perspective of the early christians, not that I believe it really. I shouldn't even probably attend mass at this point.
And speaking of being 'historical', as in written down by a witness, there are things in the bible that strikes me as 'filled in'. I only go to church during easter, so it I had it read to me very recently.
Like the story of Jesus praying in Getshemane, it was supposed to be jesus' personal prayer, who witnessed that?
Or Jesus personal discussion with pontius pilate, again, who wrote that down? Maybe someone interviewed pilate again later, I don't know, that doesn't seem too plausible, as I never heard the name pilate written down again as one of the accounts.
Or when Jesus got tempted by the devil, again he was supposed to be alone. Did he tell his disciples afterwards, or is this completely creative writing (or oral as the first christians did it)?
These are just some of the thoughts I had while listening to the sermon. My point is I think that there was some artistic license in the whole mythology of Jesus. Maybe 'to make it flow better' or something like that.