Historical dissensions, are the obvious conclusion.
However, in light of modern norms, one cannot deny that the hatred against Western countries in Muslim countries has encouraged those who really want vengeance for the mockery and deception done to their culture to target on the closest stereotypical enemy they could get their hands on apropos: the Christians.
Hence it is crucial for a Christian to live his/her life with full goodness and righteousness of the Lord while not too easily indentify themselves with Western christianity. This will not only clear the stereotype of Muslims' view on Christians, but make God's exclusive glory known.