Galatians 2:14 But when I saw that they walked not uprightly according to the truth of the gospel, I said unto Peter before them all, If thou, being a Jew, livest after the manner of Gentiles, and not as do the Jews, why compellest thou the Gentiles to live as do the Jews?
15 We who are Jews by nature, and not sinners of the Gentiles,
Paul is questioning Peter, why he lived one way before these Jewish brothers arrived, and then changed when they came. Even though Peter knew the Gentiles had been accepted of God in their uncircumcised condition, he still felt that it would be good if they would not fight the Jews on this issue. It seems that many of the Christians were afraid of the Jews. It appears to me that Paul is saying, make up your mind whether you are a Jew or a Christian, and live accordingly. Let the Gentiles alone. If they are good enough for God in the condition He called them, then leave them alone. Do not try to make them conform to Jewish customs. Paul is saying that he too, had been a Jew by birth. The gentiles were sinners by nature because they had no revealed divine written law to guide them toward salvation or living righteously. Again it is not for us to try to make someone conform to a legalistic salvation because it is by grace that we are saved. Please attend a church today that will help you understand the word of God the way it should be understood.