Using a musical analogy, a choir with harmony always sounds better than a unison choir. The more parts that are introduced, the better the music sounds. God has decided not to come for one type of culture, or one type of people, but all cultures and all peoples. God is glorified in this harmony of believers worshiping Him in spirit and in truth in their respective cultures.
It is interesting when people bring race into the equation, as it often is because of some agenda ("Jesus was for Jews only," "Jesus was for Gentiles only," "Jesus is the Black Messiah who is going to deliver us," etc.). God is more glorious than that -- He loves the world through His Son, and has promised eternal life to anyone who believes in Him (John 3:16, Romans 10:9-13).
When any person or any group goes against John 3:16 and tries to claim Jesus as only for them, that is a serious insult to a just and loving God who is propitious toward sinners from all backgrounds and all walks of life through faith in Jesus Christ.
People are always missing the forest for the trees, and in this case, they missed the tree, too.