When Cain killed his brother Abel, so the story goes, his skin turned black.
As far as I know, it just says that he was marked. At least that's how it goes in the ol' KJV.
You see, if you can convince a large enough group of people that black people are black because somewhere down the line their ancestors sinned agregiously it makes it a little easier to enslave them, and take away their God-given agency
This, as you may perhaps know, was exactly one of the Biblical justifications for slavery of Africans in the past.
Even if Cain did "turn black," wouldn't his dirty race have been swept away during Noah's flood? Or did Noah take two of every ethnicity along with him?
The white supremacist's answer might be "Noah took two of them along as 'beasts.'"
Honestly I find white supremacism kind of dumb. I mean, compared to Asia's history, Europe is developmentally challenged. Asia has everything cool, and Asians usually do way better on tests. Plus they developed kung-fu, which rocks.
What do white guys have that even compares? (I guess I'm an asian supremacist, or something.
And I'm a white dude, btw.