The famous (and often infamous) crusades of the Middle Ages were initially launched for religious reasons. With the loss of sacred sites in the Middle East, along with the massacre of resident Christians, by Muslims in the 11th century, the reigning Pope of the time called for a military response by European powers to restore Christianity's hold in the areas violated. In later years and with later crusades, other motivations arose (economic, political, personal, etc.), but the religious motivation was always at work in some fashion.
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Pope Urban II
The fourth crusade was launched in 1201 by Pope Eugenisus III
Christians or the Roman Catholic Europeans because they wanted the "Holy Lands" back from the Muslims but it never belonged to them in the first place
the Crusades originally had the goal of recapturing Jerusalem and the Holy Land from Muslim rule and their campaigns were launched in response to a call from the Christian Byzantine Empire for help against the expansion of the Muslim Seljuk Turks into Anatolia.
Western Europeans launched the crusades primarily for religious reasons. The Catholic Church believed that capturing Jerusalem and the Holy Land from Muslim control was a holy undertaking and would help to secure the salvation of their souls. Additionally, some nobles saw the opportunity for wealth, land, and increased power through participation in the expeditions. Political motivations such as expanding Christian influence in the East and diverting internal conflicts also played a role.