I may regret this but context is helpful.
Most of the Un Christian excesses in history were at the instigations of a huge, power mad bureaucracy know as The Church, not Jesus.
The Vatican propped itself as the Vicar of Christ, and subsumed the role of King of Kings.
Charlemagne, champion of Frankish Christendom, beheaded 4500 of the locals when he brought Chistianity to Saxony as a way to teach them The Way. They had refused to abandoned old Wotan and Donnar.
In the early 13th Century the Albigensis in Frankia became the target. At least 10,000 slaughtered. They were a tiny subset of ascetics. Even married couples practiced chastity. Wanted to be left alone. Wanted to Not get robbed through the Tithing.
Their biggest sin? They had the nerve to point out that nowhere in Scripture was there any mention of a Pope being necessary to individual salvation. Their Catholic neighbors didn't care but the Vatican did.
Part of the rationale for the Crusades was to get Europes Nobles out of warring with each other by giving them a common enemy so the Vatican's Unification pogrom at home could advance.
Look at Pope Alexander VI and his children, Ceasare and Lucretia Borgia.
The Church held a monoploy on Christ, and as with any huge bureaucracy it became a tyrant.
People went along with it because it was Literally All they had to get them through the nights.