So for example, do you deny that Paul taught Gentiles to obey the greatest two commandments, the other things commanded in then Ten Commandments, or against doing the things listed in Galatians 5:19-21, Titus 3:1-3, and 1 Corinthians 6:9-11? While Paul taught against becoming circumcised for incorrect reasons, such as becoming save, he was a servant of God, so he never taught against obeying what God has commanded, and if you insist that he did that, then you should follow what God has commanded rather than Paul. The bottom line is that we must obey God rather than man, so we should be quicker to disregard everything that any man has said than to disregard anything that God has commanded. In Deuteronomy 13:4-5, the way that God instructed His people to determine that someone was a false prophet who was not speaking for him was if they taught against obeying what He has commanded, so if you think that Paul did that, then considering him to be a false prophet would be correctly acting in accordance with what God has instructed His people to do, though again the reality is that Paul was a servant of God who never spoke against obeying what God has commanded, so it does not need to come down to that.