Well, first I would tell you that Jesus Christ did not teach what we now know as Christianity. Jesus taught the fulfillment of prophecy for Israel.
Rom 15:8-12 Now I say that Jesus Christ was a minister of the circumcision for the truth of God, to confirm the promises made unto the fathers: (9) And that the Gentiles might glorify God for his mercy; as it is written, For this cause I will confess to thee among the Gentiles, and sing unto thy name. (10) And again he saith, Rejoice, ye Gentiles, with his people. (11) And again, Praise the Lord, all ye Gentiles; and laud him, all ye people. (12) And again, Esaias saith, There shall be a root of Jesse, and he that shall rise to reign over the Gentiles; in him shall the Gentiles trust.
Note that verses 9-12 are prophecy about Jesus and the kingdom of Israel. The "people" here is referring to Israel.
Jesus gave Paul ADDITIONAL, NEW information about the plans that He had. It's really not hard to follow if you let the scripture do the teaching. But if you have some preconceived ideas that you force upon the scripture, you'll end up where you are now.
Paul constantly spoke of the REVELATION that Jesus gave to him. But you guys say that it was just the same things that he gave the twelve. Did you every stop to think about how that makes no sense? Why would Jesus chose ONE enemy to give the SAME message that He gave to the twelve apostles of the twelve tribes?
Why would Paul REPEATEDLY claim that Jesus gave things to him SINGULARLY. Like his term "MY GOSPEL". Why did he not say "OUR GOSPEL" or "THE GOSPEL"? Do you think that Paul was self-centered or arrogant (as some claim).
Even the Bible tells us that the first believers to be called Christians were not those in Jerusalem, but those MUCH later in Antioch far form Jerusalem.
Act 11:26 And when he had found him, he brought him unto Antioch. And it came to pass, that a whole year they assembled themselves with the church, and taught much people. And the disciples were called Christians first in Antioch.
Every verse in the Word of God is there for a reason. What is the reason for this?