If your starting point for understanding humanity is a racialist viewpoint, with superiority and inferiority projected onto people because of the color of their skin, then it's so easy to take the next step of justifying that point theologically and reading it into the Christian scripture. And that makes it harder to understand what scripture is actually saying!
The God of the Bible is the God of liberation rather than oppression; a God of justice rather than injustice; a God of freedom and humanity rather than enslavement and subservience; a God of love, righteousness and community rather than hatred, self-interest and exploitation.
What always strikes me in the story of Cain and Abel is how often the word "brother" is used. Cain killed his "brother." God says it was "the blood of your brother." The killing was done to another human being, a child of God like you, breaking that sacred bond of common humanity.
I believe scripture is not just resilient but rebellious against its abuse by people. Scripture says it refuses to be used in that way for long. That is why the gospel that has been used by the oppressors is the same gospel that liberated the oppressed: They were reading the same book. Something in the DNA of Christian faith and in the Bible agitates against that kind of misuse.