fwiw Christians and Catholics officially sanctioned slavery. I don't mean it to trash the faith (in fact I can appreciate Catholicism in many ways), but I think we have to be on guard against the temptation to treat people some consider to be inferior in an unfair way.
Portuguese Slave Trade: 15th Century Rome and Its Popes Created Racist Racial Sub-classes of Humans to be Enslaved, Acting as Exarch of the Roman Empire.
https://medium.com/@isafakir/portuguese-slave-trade-15th-century-rome-and-its-popes-created-racist-racial-sub-classes-of-humans-9727229caf8
In the early thirteenth century, official support for slavery and the slave trade was incorporated into Canon Law (Corpus Iuris Canonici), by Pope Gregory IX. In 1452 Pope Nicholas V issued the papal bull Dum Diversas to King Alfonso V of Portugal which included the following words: “we grant to you…full and free permission to invade, search out, capture and subjugate the Saracens and pagans and any other unbelievers and enemies of Christ…to reduce their persons into perpetual slavery”– “to invade, search out, capture, vanquish, and subdue all Saracens, and other enemies of Christ wheresoever placed, and the kingdoms, dukedoms, principalities, dominions, possessions, and all movable and immovable goods whatsoever held and possessed by them and to reduce their persons to perpetual slavery, and to apply and appropriate to himself and his successors the kingdoms, dukedoms, counties, principalities, dominions, possessions, and goods, and to convert them to his and their use and profit…”In 1456, Pope Calixtus III confirmed these grants to the Kings of Portugal and they were renewed by Pope Sixtus IV in 1481; and finally in 1514 Pope Leo repeated verbatim all these documents and approved, renewed and confirmed them. [quoted from Wikipedia]