The people who founded 'modern' (15th-19th century) slavery were all Christians–starting with the Portuguese, and soon involving the Spanish, Dutch, French, and British, and later others.
@DavidSalo @LiberalLibrarian The Church, as you may know, gave the conquerors a rubric: they could enslave peoples who had heard the Gospel but were not Christians (i.e., Africans), but they could not enslave nations that had never had a chance to hear the Gospel (i.e., Indians). Pretty often they enslaved Indians anyway, but that was the rule.
Christianity actually went from "love your neighbor" to "here's how to tell which of your neighbors you may enslave" in about 1500 years.
@ImagineThat @DavidSalo Christians went from victims of state violence to wielders of state violence far more quickly.
@LiberalLibrarian @DavidSalo Only as quickly as they could.
One could argue that "enslave these, not those" is a step up from "Kill them all, God will know his own."