It would seem to me, understanding Judeo Christians ideas, that the evolution of making African/Indigenous minorities an underclass was brought about by Europeans elevating whiteness to deity, thus, in effect, become idolators. If Africans and indigenous populations became subhuman, it meant that they were not made in the image of God who purportedly made man in his image. Europeans diverged from Christianity and became idolators when they placed themselves and whiteness in the place of God and made divisions based off who were not white like them. It's the same for American protestantism and white nationalism. It's idolatry, not Christianity.
I use to think that there was space to be pro-black and Christian. As I get older, I'm starting to realize that the ideas that came forth from Christ are so revolutionary, that there really isn't any space for "blackness" or "whiteness". And yes, it's puts black people who consider themselves Christian between a rock and a hard place because white people have so weaponized Christianity with whiteness, black people have no recourse but to fight back with blackness. But it's incongruent with the Sermon on the Mount. I think MLK realized this which is why at the tail end of his life, he was trying to unite and galvanize all people who were victims of capitalism, hence the Poor People's Campaign, which I think embodied Christian ideas the most, and why he really became a threat. True Christians ideas are a threat to mainstream societies which is why Christ proclaimed that his kingdom isn't of this world. The Black Panthers, who, I don't think were religiously affiliated, appeared to be moving in this direction as well.