In the Middle Ages the church dominated almost every aspect of European life. Going to church then wasn’t voluntary (neither was tithing), people were forced to go to church (and forced to tithe), it was mandatory. The church condoned feudalism...a kind of institutionalized slavery...where the subjugated peasantry did all of the hard labor.
I am sure that there were many actual slave owners in the American colonies and, later, states who were well respected members of their bible based churches.
"Don't believe everything you see on the Internet" - Abraham Lincoln
