The Body of Christ was a mystery revealed to Paul after Israel fell in Acts 7.
Since the nation Israel fell, all Jews and gentiles are now saved thru the body of Christ thru the gospel of the grace of God that was revealed to Paul.
So in that sense, it is not strictly gentiles. But then again, Israel was declared uncircumcised by the Holy Spirit in Acts 7:51, so in another sense, Jew and gentiles can be considered equally uncircumcised before salvation since Acts 7.