You said both Jew and Gentile are in the Body of Christ.
Today, there is neither Jew nor gentile! All may be part of the
Body of Christ! Back in the New Testament there were 2
different messages being preached, to the Jew; The Kingdom
Message! To the gentile, "The Grace Message" as taught by
"The Apostle Paul!" Peter and the rest were preaching to the
Jews. Paul, to the gentiles!
Galations 2:7 "But contrariwise, when they saw that the
gospel of the uncircumcision was committed unto me,
as the gospel of the circumcision was unto Peter;"
Two separate Gospels! The one to the Jews, the other to the
gentiles!