Agreed. If you were to read the entire Galatians without Protestant tradition you would see that it is about the relationship between faith and "works of the law," i.e. circumcision and the Mosaic Law, not between faith and the moral law. It is an attack against the Judaizers. This is why he mentions the Council of Jerusalem. Thus Paul's warning about those who persist in sin will not inherit the kingdom of God is not contrary to what he says about the works of the law. Paul's own summary:
It is those who want to make a good appearance in the flesh who are trying to compel you to have yourselves circumcised, only that they may not be persecuted for the cross of Christ. Not even those having themselves circumcised observe the law themselves; they only want you to be circumcised so that they may boast of your flesh. But may I never boast except in the cross of our Lord Jesus Christ, through which the world has been crucified to me, and I to the world. For neither does circumcision mean anything, nor does uncircumcision, but only a new creation. Peace and mercy be to all who follow this rule and to the Israel of God. From now on, let no one make troubles for me; for I bear the marks of Jesus on my body. The grace of our Lord Jesus Christ be with your spirit, brothers. Amen. (Galatians 6:12-18)
You are partly correct.
After you outline Galatians, I’d love to hear your conclusions.
Before seminary, I started to outline books of the Bible, verse by verse, paragraph by paragraph.
Later, I had to do every book in the OT and NT.
It was a lot of work, but fruitful work.