"Staged" Creation

[FallentoReason]

These teachings were received from the Apostles.

Debatable. Is there any concrete evidence that shows the Gospel authors knew any of the Apostles in person?

And I don't see how these things are mutually exclusive. I believe that for example, Jesus telling the parables is a historical event and it also conveys deeper teachings.

I'm arguing here that the Gospels as a whole are 'parables' or written allegorically. That would make the parables of Jesus a form of inception I guess.. a parable within a parable.

The individual parables themselves are not historical events (probably),

Yes, I definitely agree.

and other flourishes on Jesus life may also have been added to convey these teachings and underline certain theological points (the meaning of the three gifts of the magi or the conversations on the cross for example),

Without a doubt there are bits that aren't original to the greater parts of the Gospels e.g. Mark 16:9 onwards and John 21. Maybe you didn't mean exactly these sorts of 'enhancements' but I see them as definitely trying to make the manuscripts more convincing.

or they might just be convenient history. Either way it doesn't matter, does it?

What I brought up about later additions wouldn't be actual history. Anything that wasn't written by the original authors has to be seen as having a dishonest intent for being in there, unless the authorship of these additions can be verified and therefore get an understanding of why they might have added it.

I think it greatly matters how the Gospels should be interpreted because ultimately that will give you a better understanding of your own faith. I remember sharing these thoughts with a Christian friend and he would tell me 'but these allegorical interpretations have no place within Christianity!' and I asked 'but what is Christianity?' My point is this: how can you essentially debate against the fathers of Christianity about what Christianity is? I don't think anyone gets a right to say what it truly is but them. Therefore wouldn't it be beneficial (especially to Christians for obvious reasons) to know a) who wrote what and b) what they meant to say?