“there is neither Jew nor Greek” (Galatians 3:28).
This creates “one new man” (Ephesians 2:15), unifying all ethnicities under Christ, all being equally sons of God, “who were born, not of bloodline nor of the will of the flesh nor of the will of man, but of God” (John 1:13). This is the provision of the New Covenant, which is based on the will of God and His oaths, swearing to make it happen.
Few people have any serious understanding of this—even Christians—because most do not know the difference between the two covenants. The Old Covenant is man’s vow to God and is based on the will of man; the New Covenant is God’s vow to man and is based on the will of God. The Old Covenant applies the law to govern the flesh and to regulate its behavior; but in the New Covenant God’s Spirit works within the heart to change our nature so that our behavior changes automatically.