correction...Paul brought the out of Covenant Israelite gentiles back into the Covenant because the law of divorce, that kept them from going past the 3ft middle wall of separation in the temple, was made void by the death of Yah'shua. This is why in Romans 7, Paul starts out by saying :if you do not know(understand) the Torah (5 books of Moses) then he is not speaking to you. IOW's, if you don't study the front of the book to know the significance of YHVH divorcing the Northern kingdom of Israel, then you have no clue what the back of the book is all about, let alone who the players are.
Rm 7:1 Surely you know, brothers - for I am speaking to those who understand Torah - that the Torah has authority over a person only so long as he lives?
[NKJV] 7:1 Or do you not know, brethren (for I speak to those who know the law), that the law has dominion over a man as long as he lives?
I agree you cannot possibly understand Christianity if you haven’t studied Judaism