A Radical Revolution
It should be called the Protestant Revolution. It was not a reform of the Catholic Church at all but the creation of a non-Catholic church system which allows for many denominational variations.
The fact that the Protestant Reformation occurred at all is evidence the Catholic Church had made serious errors. But in doing so the Protestant Reformers created some new doctrines which are just plain wrong ...
The saving grace for the Protestant Reformation is that they kept the foundational doctrines about God, the human condition, Jesus, and salvation. Otherwise, Protestant communities and denominations would not be Christian at all.
A side-effect of the Protestant Reformation was that Christians went to war with Christians. This is evidence that all was not right with Christendom. If the Catholic Church had not allowed itself to become corrupt and had insisted on holiness for the bishops and priests, the Protestant Reformation would likely have never occurred.
Jesus did not establish a political kingdom, yet that's what Christendom became. The concerns of the state by Christian rulers trumped the pastoral concerns.
Jesus said, "My kingdom is not of this world. If it were, my servants would fight to prevent my arrest by the Jews. But now my kingdom is from another place." (John 18:36)
I look with sadness on the various world events throughout history in which Christians are persecuted or when they are the persecutors. Certainly in the early days of Christendom it seemed like Christendom was a good idea. But in the face of heresies and finally the Protestant Reformation, Christendom is shown to be an unsustainable political system.
At many stages in human history when ideas clash the inevitable result is war and devastation. This is sad. But there would be no wars if there were no violent men. Unfortunately, there are some who are violent and they often become the rulers. We must strive for peace even among the various Christian groups of modern times. We must put an end to religious wars, of Christians fighting Christians.