One of the tenets of Islam is to kill nonbelievers. Islam 101
TheReligionofPeace.com - Guide to Understanding Islam
"The Quran contains at least 109 verses that call Muslims to war with nonbelievers for the sake of Islamic rule. Some are quite graphic, with commands to chop off heads and fingers and kill infidels wherever they may be hiding. Muslims who do not join the fight are called 'hypocrites' and warned that Allah will send them to Hell if they do not join the slaughter."