Thanks K.O.W for the warning, and for your excellent Post above, and your Posts on other Threads, your Post about Marcion filled in details for me I was not aware of, thanks.
As for the Thread Title, Paul was a failed prophet, he predicted the resurrection etc, would come in the lifetimes of his readers, it didn't, so later Works, like 2nd Thessalonians, were written to excuse this error, and to somewhat obliquely discredit Paul.
My view is that Paul's Theology/Christology is very much his own, and the voice in his head persuaded him to believe that the claims of some 1st Century BCE "Christians", those who thought they had found a Messiah (Christ), and that their chosen individual had been resurrected, were true.
The other Christian Groups of the late 1st Century BCE and those of the !st Century C.E may well have had a Christ different to Pau's, hence maybe why he was not impressed by any Teaching he found in Jerusalem, he just didn't want trouble from them as he took his Gospel and his Christ to the Gentiles.
The later Mythos that we find in the Gospels is a very different Christ to Paul's.