Philosophically, I disagree with every thing you have said.
Jesus sent his apostles to teach the lost sheep of Israel something old but in new light, and this overflows to the world; Israel was always to be a light to the world.
I do not ignore what the authentic apostles say, first understanding that they are human like me. Jesus established an important rule, found in the Gospels: If Jesus says something it is only true when His Father is a second witness to it. Jesus in every way confirms the authenticity of the OT, and the OT authenticates Jesus. So it is with the NT writings they need to be confirmed by the OT, these two witnesses have to be in agreement.
In the Bible there is a system of repeating patterns, types and anti-types, repeating history and repeating prophesy; It is not coincidental that Jesus chose 12 apostles, one for each tribe, that He sent out 70 apostles to establish the new covenant, that there are four Gospels, each showing Christ in one of four forms, as a lion, as an eagle, as a bullock, and as a man; the symbols that were on the banners that Israel camped behind in the wilderness. Paul does not fit into these patterns, he is an odd bod. There are other patterns concerning false prophets that I am not familiar with, but much is said about them in the OT; I believe Paul is an anti-type of those.
The NT has been edited and likely the OT also, beware. Jesus selected 12 ordinary men, yet Paul is a superman.