But when Peter came to Antioch, I opposed him in public, because he was clearly wrong.
Before some men who had been sent by James arrived there, Peter had been eating with the Gentile believers. But after these men arrived, he drew back and would not eat with the Gentiles, because he was afraid of those who were in favor of circumcising them.
The other Jewish believers also started acting like cowards along with Peter; and even Barnabas was swept along by their cowardly action.
When I saw that they were not walking a straight path in line with the truth of the gospel, I said to Peter in front of them all, "You are a Jew, yet you have been living like a Gentile, not like a Jew. How, then, can you try to force Gentiles to live like Jews?"
Indeed, we are Jews by birth and not "Gentile sinners," as they are called.
Yet we know that a person is put right with God only through faith in Jesus Christ, never by doing what the Law requires. We, too, have believed in Christ Jesus in order to be put right with God through our faith in Christ, and not by doing what the Law requires. For no one is put right with God by doing what the Law requires. 1
References for Galatians 2:16
If, then, as we try to be put right with God by our union with Christ, we are found to be sinners, as much as the Gentiles are - does this mean that Christ is serving the cause of sin? By no means!
If I start to rebuild the system of Law that I tore down, then I show myself to be someone who breaks the Law.
So far as the Law is concerned, however, I am dead - killed by the Law itself - in order that I might live for God. I have been put to death with Christ on his cross,
so that it is no longer I who live, but it is Christ who lives in me. This life that I live now, I live by faith in the Son of God, who loved me and gave his life for me.
I refuse to reject the grace of God. But if a person is put right with God through the Law, it means that Christ died for nothing!