While it may be shocking to read the things that Christians have done throughout history, perhaps a Lutheran articulation of a point made earlier will be helpful. We tend to look at the individual Christian life as a connundrum called the Sinner Saint-- simul iustus et peccator. It is applied from St. Paul’s letter to the Romans, as he laments his petition to God (and his reader) asking who will liberate him from his body of sin and death? Thanks be to God, it is Christ.
The Church of Christ, similarly constituted of sinner saints in the particular, will reflect that connundrum in the aggregate. We can evalutate history according the standards of God’s Holy Word, because that doesn’t change (hence, its role as canon, or rule of faith.) We can recognize the errors of the Church in the past, just as we can recognize them in the present, which gives us opportunity to repent and bring forth fruits worthy of repentance. The Scriptures unveil thousands of years of history, critiquing kings and princes and even prophets and high priests as sinners in need of repentance. The unwinding of Church history over the last 2000 years should not surprise us when it reflects our common patrimony. The Church is not divine per se, but she is the place where the Holy Trinity comes to receive and forgive and bless repentant sinners, saving them from sin, death, and the devil.
While there were some unsavory characters in the long 2000 year history of the Church (and your offering below only scratches the surface, not to mention the couple thousand years before that going back to Abraham) there are many more saints of amazing faith and love, still remaining the salt of the earth. Numberless fathers and mothers sacrificed all for their children… priests who served faithfully without any historical footnote… monastics without name who took great pains to transcribe the Holy Scriptures and the works of the ancient Fathers, preserving them to our day… and so on. But of course, in the scope of eternity, whether we recognize a name as worthy of note is really quite meaningless… what really matters, is how that name is known by God Almighty.
The Church is composed of we sinners, who are saved by grace through faith in Christ. When we are called together into community as the local congregation, diocese, or globally as the Universal Church, we should not be surprised to find sinners being sinners. Ours is not to excuse sin, but to call all to faith and repentance… in every generation.
Grace and peace.