Christianity and Islam have both been through this stage: when power-hungry followers of the religion insisted (contrary to the words of their holy books, because Christianity also doesn't permit mass murder) that everyone else was wrong and evil and should be killed.
Christianity grew out of it before the real advent of world politics and human rights. Islam was founded later, and therefore has not yet grown out of it. Therein lies the problem.
And of course, it's only a minority of Muslims and all that, but the Crusades were carried out by a minority of Christians. Just because something was done by a minority doesn't excuse it, and nor does it sever its ties with the religion. Christianity was responsible for the atrocities of the crusades and the Inquisition. Islam is responsible for the actions of al-Qaeda and the oppression of people in the Middle East (which is thankfully now ending).
(Former) Lead Moderator and (Eternal) VGC Detective 
