Why are people of color Christian?

I mainly mean in the Americas.

South America was essentially conquered and colonized. They had their own thing going , and now they believe in the god of the people who almost killed them all.

Black people in America are mostly descendants of freed slaves. Again, before they were enslaved, they all had their own religion. Now they worship the god of those who enslaved them.

I’m an atheist, so I won’t suggest a better religion. But it astonishes me that people would adhere to the religion of people who did such terrible things to them.

If an alien army wiped out most of humanity, enslaved the rest and took all our resources, I wouldn’t be in a hurry to adopt their beliefs. I would be angry and confused if anyone started liking what the evil aliens liked over their own beliefs.

Why the hell are African Americans Catholics or Christians? Why do Hispanics or Latinos worship the Christian god of those who gave them such suffering?
Is it just assimilation?

If I were black or brown I would be offended to be worshipping the same god as those who oppressed me.