Jesus was no a "Jew" in the religious sense at all. If so he would have had no issues with the Pharisees. Jesus scolded their oral law and traditions which later got codified into the Talmud.
The Jewish religion from his day to today is not under Torah Law. And that is the argument - do the Jews, or anyone, have the ability to change God's Laws? The Jews did. And the Christians do too.
Jesus a Jew from the fact he was of Judea. Not by religion.
He and Paul have NOTHING to do with Christianity which started 300 years after he died.
The KJ bible installed the word Christian and church into the bible to mislead you. They were not Christians at Antioch that went to church. They were spiritual Israelites that assembled.
Jesus taught at synagogues and in the open. Not in pagan churches.
Look you do not understand what a Jew is. And what Isreal is. The promises of God were given to Israel not to Jews. God divorced the Jews in the OT. Jeremiah 3:8, Hosea, etc. You have been misled.
A Jew as Paul is talking about keeping the Jewish oral law. You do not understand what Paul is talking about. When he uses the term "LAW" it does not always mean the Torah Law. That is where you folks miss it.
Paul tells you you will be judged by the Law in Romans 2:13. In Galatians he is not talking about the same law.
You have to know Judaism and the oral vs. the written law to get this and this stuff is over your head.