I think we have to recall that the first Christians were formerly Jews. As were all Christ's disciples Jewish. Those men whom he chose to be his disciples.
Maybe accepting the consolidation of Torah into the new testament is the key. MJ's after all do accept Jesus was Messiah.
I think Paul is an example of a Jew, a Pharisee, and a Roman citizen, accepting Jesus was the prophesied Messiah. Who better to know the scriptures than a Pharisee? And to accept Jesus was the promised one says a great deal.
I think that is why Jesus appeared to him. Knowing what Jesus had called vipers before he departed the world would never accept him of their own accord.
But a man who did not know Jesus while he walked and delivered his ministry. A Pharisee, who held Stephen's cloak as he was stoned to death. And that Pharisee, one of the most learned in matters of all things pertaining to the Jewish faith and law, received the truth of Christ while in his travels to persecute yet more Christians who were formerly Jewish.
Powerful testimony there in scripture concerning Paul.