Usually if talking to a Christian about slavery, their thought processes about it will lead them to think about endentured servitude. Even though that was only a thing when dealing with Israelite slaves or bondmen. They dont go to the verses that talk about how you can "bequeath" your gentile slaves to your children or how you can beat your slave but only to the point where he will still be alive for at least 2 days (if i remember correctly, correct me if not). These verses are rarely mentioned

Say you don’t know how to study history and culture without saying you don’t know how to study history and culture …

Did you know that they changed the word “servant” to “slave”? Read the original King James and see for yourself. Why would they (Catholic Church) change that? Why would they change other things like remove the one verse that destroys the doctrine of infant baptism? Why would they change like over 3000 things? Hmm….

You cited books of Old Testament which are contradicted by New Testament. In case of contradiction, New Testament is more important. Also what translation did you used? It's important because many U.S. versions of bible still have remains of which were deliberately translated to validate slavery.