How did the Crusades change religious attitudes?

it depends on the person who's religious attitudes you are questioning. some people became closer to god through the crusades, believing that the task of killing Muslims was holy and made them closer to heaven. after all, at the council of claremont in 1095, Urban II told his audience that all who went to the crusades and died would get immediate emission to heaven and skip their time in purgatory. for the eager adventurers who went on the first crusade, this would have made them closer to the church

however, for some people the crusades caused a distance and distaste for the catholic church. returning crusaders who witnessed the slaughter of Muslims and Jews in the name of god began to question their own faith. in his 10 Opus majus, English philosopher and Franciscan friar Roger Bacon wrote

"(those) who survive the wars and their children

are more and more embittered against the Christian faith owing to

these wars, and are infinitely alienated from the

faith of Christ, and inflamed to do all the harm

they can to Christians."