The medieval Christians were a group of people who were followers of Jesus Christ and believed that the only path which a person can obtain eternal salvation was through believing and confessing in Christ and eliminating sinful acts from their lives. The Roman Catholic Church was one offshoot of the medieval Christianity
With this in mind, there were several crusades which were indeed Holy Wars led by the Knights Templar against the enemies of the Church and led to a lot of deaths and also financial and economic losses over several years. There was also a witch hunt campaign where suspected witches were burnt at the stake.
Please note that you question is incomplete so I gave you a general overview of the history of the Medieval Christian Europe
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