You have to remember that Paul was writing to Gentiles in Corinth, not to Jews. The Gentiles there had been given mistaken teaching by Jewish Christians that they needed to observe the Torah, and Paul was trying to talk them out of it. He was bringing the message of the Council of Jerusalem to them, that Gentile believers need not be circumcised and observe the Law. However, that Council left in place that Jews should observe Torah, and none of Paul's letters are addressed to Jews.
You have to remember that Paul was
writing to both, there were Jews and Greeks in the Corinth Church, we have one faith, one baptism, one body as per Eph 4..
Look at this verse, from a chapter that was about Jew and Greeks ,the one new man, Jew and Greek, came after the abolishment of the law, this verse is for BOTH PARTIES.
Who, is in the "us" and the "both"?
15 by
abolishing the law of commandments expressed in ordinances, that he might create in himself
one new man in place of the two, so making peace, 16 and might reconcile
us both to God in one body through the cross, thereby killing the hostility.
ROMANS ADDRESSED JEWS...in fact, there were Jews in all of his churches, stop segregating, the church.