Unfortunately, there is only one Church, with as much historical reality as its Founder, and we cannot appeal to some better, ideal Church against the inadequacies and offences of the Church as it is. Unfortunately, we can only get hold of the ideal Church in the empirical Church. We have access to usage only in ill-usage, ab-use, which cannot be abolished but must be improved so that it can become credible and usable once again.
von Balthasar, Hans Urs – Truth is Symphonic [Ignatius Press 1972, trans. Harrison, Graham1987, p 75]
Having "said" that, Christian history, as opposed to European secular history, is less bloody than many modern critics like to imagine (the Inquisition sheltered accused "witches", for instance, and recent estimates of numbers of casualties for both outrages are far fewer than many realize). Apart from the Crusades (and see Firestone's Jihad - The Origin of Holy War in Islam) and Reformation, Christian history has many more folk like Catherine of Siena, William Law and Maximus the Confessor than Bernard Gui and Torquemada.
The great atheist/humanist political systems that reject Christianity - fascism and communism - have been responsible for the industrial slaughter of millions of human beings in a way and on a scale no Church persecution or popular pogrom ever did.
Atheist political correctness seeks to anathematize Western culture, history and religion, and distorts the truth for its own ends. To consider Christianity as the source of human evil is to overturn historical reality for ideologically fashionable nonsense, IMHO.