To be members of God’s covenantal people, it is not necessary for gentiles to become Jews. They do not need to be circumcised, observe the Sabbath, keep kosher or any of the rest.
They need to believe in the death and resurrection of the messiah Jesus.
Prior to this, the followers of Jesus – the first Christians – were of course Jews who understood that he was the messiah who had died and been raised from the dead. But they knew this as the act of the Jewish God given to the Jewish people.
Certainly gentiles could find this salvation as well. But first they had to be Jewish. Not for Paul. Jew or gentile, it didn’t matter. What mattered was faith in Christ.
