The Christians didn't bring the slaves here, but once they were here, somebody had to take them in.
Naturally, good Christians treated slaves better than bad Christians.

They were making the best of a bad situation.
You have to think.
If the slaves went free, then where would they go? To the North, heaven forbid?
It was bad for blacks anywhere in America.
Still, many Christians assisted slaves in becoming literate, in buying their freedom, and in being able to support themselves in the New World.