The plan of salvation, the main theme of the entire bible seems so simple, all this tearing it all apart with what is the law's place in this, what is a Jew and gentile in God's eyes, all the little twists and turns are just taking our eyes from the big picture. The twists and turns of this must fit into the overall scheme or we don't have the jig saw of scripture making the correct picture.
We are all God's children, Jew and gentile. At creation, God made a plan for salvation for all God's children, and that plan was Christ.
There are thousands of years of twists and turns. The flood, when God started over. Abraham when God separated a gentile man for a special commission, with the benefit of all creation in mind. Christ as only a symbol for thousands of years, known only to the people now called Jews. The next step, when Christ fulfilled what the symbol of Him told of.
Now, it gets hard to figure our place. God says he is protecting the special people God used for us, he lets them deny that He finished the work he was supposed to do, and for about 2,000 years the gentiles have been out to "get" the Jews. Murders, ghettos, special laws against them, talk of "those Jews". Only special Christians knew to just let them be to God.
The law got pulled into the mess. It was given as a holy guide for us, to learn from. It takes a secondary place after we are given the Holy Spirit, and people are mixing up following it with their thoughts about Jews. It is all tangled up. Instead of something holy to help guide us, very simple and beautiful, it becomes something against salvation, something against Jews, all sorts of strange things. Demons against our sanctified church are using it so the ten commandments are to be cancelled, even, and most of our churches are sanctified no longer as a place set apart for only those who follow Christ. We must fit law, Jews, all of scripture into the main picture so we see clearly.