I totally agree with you about those inside the Body of Christ, even though Paul does refer specifically to the GENTILE BELIEVERS in Romans 11. However, there are the unsaved ethnic Jews that, according to both the OT & the NT, God is not finished with yet. These natural branches, once broken off, will be re-grafted in.
All part of God’s plan.
Those who are among God’s elect, “for election’s sake,” will be regrafted into the root. Once in the body of Christ, spiritually speaking, they will look just like everyone else. Neither Jew nor Greek. That’s part of the real blessing of the “one nation” that Christ has been constructing.
In any event, there is no justification for using racial language in the body of Christ, now or in the future.