A couple of thoughts:
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Could we say that race, much like gender (vs. sex), is a social construct, and it would be much more helpful to talk in terms of ethnicity? That is, to divide people based on skin color (for instance) is as arbitrary as categorizing humans based on height or hair color?
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Theologically, it seems like Genesis 1:26-28 would be foundational (i.e., all humanity is created in God’s image and thus worthy of respect), as well as other passages like Galatians 3:28 (our identity in Christ is not based on ethnicity) and 5:6 and 6:15 (where ethnicity is described as an adiaphoron), not to mention Eph 2:11-21 (where Christ’s work is described as unifying humanity and breaking down the dividing wall of hostility based on ethnicity).
Thus, based on the activity of God in creation and Christ in redemption, one finds a solid basis for unity among humanity and no basis for divisions or hostility with regards to race/ethnicity.