The statemten that best describes how the Crusades affected the relationship between Muslims and Christians is: The Crusades increased the bitterness and mistrust between the people of the two faiths.
The Crusades constituted a series of religious wars sanctioned by the Latin Church in the medieval period. The most commonly known Crusades are the campaigns in the Eastern Mediterranean in search for the recovering of the Holy Land from Muslim rule, but the term "Crusades" is also applied to other church-sanctioned campaigns.