Peter was wrong. And if those from James felt the way Peter thought they did, so were they. That's why Paul withstood him.
"As you can see there was a difference between Jewish and Gentile believers.
Rather, Acts 11 recounts Peter's declaration before the Jerusalem church that in the eyes of the Lord, there is no difference between Jewish and Gentile believers.
"So if the doctrines taught were the same there would be nothing that is 'hard to be understood'."
Wrong. One doctrine with some parts hard to understand. Peter upholds Paul's teaching here - he doesn't disagree with it. Those that "wrest the scriptures" are the ones that disagre with Paul's doctrine.
Again, "one Lord, one faith, one baptism." Your argument is with Paul, not with me.
You are the one that brought this old thread back to life.
There is still a difference between the worship of the Jewish Christians and Gentile Christians at that time. You still cannot ignore it. We today would call it “Denominational-ism”.
Again, why would James tell any Christian to offer sacrifices in the temple when sacrifices were done away with or brag about all the thousands of Jewish Christians were “zealous of the Law”.
And if they had no differences why would Paul have to write to the Galatians who had fallen under the Law to show them the difference between Law and Grace.
And later, Paul’s lament that those of Asia had turned away from him.
Christian doctrine at that time was not monolithic.