According to you, Jesus taught salvation by works. So Jesus would have re-enforced a false Gospel.
That was not the mystery. The hard thing to understand was how the Gospel related to the Gentiles and their entrance into the Kingdom of God, as Gentiles. Romans 9, 10 and 11 are dedicated to that discussion.
That is not the same mystery as spoken of in I Cor. 2.
And yet, we have no record of them teaching salvation by works. You keep assigning that value to them, but you are really just wrong.
Actually the word for "end" is telos and as used in that context means "goal," or "focus." Jesus is not the termination of the Law.
They never taught salvation through the law, either.
But Jesus only ever taught a spiritual redemption. They were not looking for a Savior, but someone to overthrow Rome. But that is beside the point. The fact is that Jesus came to be a Savior, the first time, and will fulfill the role of King/Messiah when at His bodily return.
And Yet we don't find THAT teaching in any of their epistles in the NT. Again, that is just you making up a lot of bogus garbage.
That's because you don't have a very firm grasp of the material, particularly the text of Scripture. You don't see two gospels that offer contradictory messages confusing. That only shows that you really don't think these things through. Peter encountered Gentiles at Cornelius' home. What did they have to do to be saved? They didn't have Paul on hand to preach to them. All they had was Peter.
That is not how salvation worked in the OT and that is not how it was taught by Jesus or the disciples. Salvation was the same for everyone and it was always by grace through faith. That would amount to ways of salvation and that is anathema to anyone competent in scripture.
Well, I go by the Bible's approach to works, not your carnal misunderstanding. We are not saved by works, meaning we are not saved by any meritorious act. The Bible uses works to describe our thinking and conduct before God. When it says we are not saved by works, that means there is nothing meritorious, sacramental, no good work (which is not the same as "good deeds"), that we can do to earn God's favor. Nothing that is pleasing to God that we can perform is efficacious for salvation. Baptism isn't work because baptism isn't sacramental. It is a sign, not a work. Baptism follows faith, not the other way around.
Does it need to spelled out to you? It's pretty clear that circumcision crowd lost.
But not for salvation. I fully expect Jews to live like Jews. And Christians who were Jewish didn't see Jesus as the abolition of the Law of Moses, but rather as its capstone. He was the fulfillment of the Law and the prophets. But nowhere do we find that they promoted a works-based salvation anywhere in Scripture.