Jesus smashed down the separations between the Jews and Gentiles. He did this that "He might create in Himself one new man in place of the two, so making peace." (Eph 2:15) We are now members of the same family and "members of the household of God." (Eph 2:19)  This same thing that unites the Jew and Gentile is what unites believers, no matter their skin color. Those old designations don't matter any more when you are one in Christ.