In Gods economy, though, there seems to be only Jew/Gentile, sheep/goat, saved/lost.
Adam's race has subdivided many times. The NT describes natural descendants of Abraham who rejected Christ while others followed him.
After the fall, sin led to division, primarily the seed of the woman and the seed of the serpent.
Both of these original entities divided many times including:
The seed of the serpent was scattered when the grandsons of Noah were dispersed at Babel "after their generations, in their nations: and by these were the nations divided in the earth after the flood." (Gen 10:22).
The seed of the woman divided into the chaste virgin and the great harlot.
Revelation takes us back to Genesis:
Rev 12:17 And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
Same story, different cast.