I’ve never said that everything the Church did was correct, I said that the Holy Spirit hasn’t allowed her to dogmatically teach falsehoods on matters of faith for 2000 years, for that would against Jesus’ own words (regarding the Holy Spirit that would have led us to all truth and that the gates of Hell wouldn’t have prevailed ).
I simply stay with the early Christians who, until the 16th century, have never thought that they were the final interpreters of the Scriptures and have always believed that the final and authoritative intepretation belonged to the Church.
And what you said about slavery is far too simplistic.
What you actually find in history is a long and uneven history in which popes repeatedly condemned enslaving particular peoples, condemned the slave trade, and insisted that masters treat slaves with justice and humanity. Paul III in 1537 said indigenous peoples must not be deprived of liberty or property or reduced to slavery. Gregory XVI in 1839 condemned the slave trade and said no one should dare reduce anyone to slavery. Leo XIII went further still, calling slavery contrary to what God and nature intended. Just to make a few examples.
So to say that the Church has nearly always approved slavery is historically incorrect. The Church was condemning slavery long before it was abolished.
“In no uncertain terms, the Church’s magisterium upholds the respect due to every human being. The Catholic Church therefore repudiates those concepts that fail to recognize the inherent human rights of indigenous peoples, including what has become known as the legal and political “doctrine of discovery”. Numerous and repeated statements by the Church and the Popes uphold the rights of indigenous peoples. For example, in the 1537 Bull Sublimis Deus, Pope Paul III wrote, “We define and declare [ … ] that [, .. ] the said Indians and all other people who may later be discovered by Christians, are by no means to be deprived of their liberty or the possession of their property, even though they be outside the Christian faith; and that they may and should, freely and legitimately, enjoy their liberty and possession of their property; nor should they be in any way enslaved; should the contrary happen, it shall be null and have no effect”. “
“In the presence of so much suffering, the condition of slavery, in which a considerable part of the great human family has been sunk in squalor and affliction now for many centuries, is deeply to be deplored; for the system is one which is wholly opposed to that which was originally ordained by God and by nature. The Supreme Author of all things so decreed that man should exercise a sort of royal dominion over beasts and cattle and fish and fowl, but never that men should exercise a like dominion over their fellow men.”
Also in 1435 Sicut Dudum Pope Eugene IV - January 13, 1435 - Papal Encyclicals
“Some of these people were already baptized; others were even at times tricked and deceived by the promise of Baptism, having been made a promise of safety that was not kept. They have deprived the natives of the property, or turned it to their own use, and have subjected some of the inhabitants of said islands to perpetual slavery, sold them to other persons, and committed other various illicit and evil deeds against them, because of which very many of those remaining on said islands, and condemning such slavery, have remained involved in their former errors, having drawn back their intention to receive Baptism, thus offending the majesty of God, putting their souls in danger, and causing no little harm to the Christian religion.”
“And no less do We order and command all and each of the faithful of each sex, within the space of fifteen days of the publication of these letters in the place where they live, that they restore to their earlier liberty all and each person of either sex who were once residents of said Canary Islands, and made captives since the time of their capture, and who have been made subject to slavery. These people are to be totally and perpetually free, and are to be let go without the exaction or reception of money. If this is not done when the fifteen days have passed, they incur the sentence of excommunication by the act itself, from which they cannot be absolved, except at the point of death, even by the Holy See, or by any Spanish bishop, or by the aforementioned Ferdinand, unless they have first given freedom to these captive persons and restored their goods.”