Islamic alludes to the religion practised by Moslems.
Islamism is something entirely different. Islamism is also known as Islamo-Fascism, and has little or no real connection with the third of the world’s great religions. An Islamist is no more a Moslem than an IRA man or mafioso is a Catholic. The fact that Islamism dresses itself in the garb of Islam and to some extent adopts its rhetoric, should not be allowed to mislead anyone.
The proof of this pudding is in the eating; although Islamism has been responsible for some of the most heinous murders of the 21st Century to date, including those of September 11, 2001, it has killed and continues to kill more Moslems than any other ideology. It is the nihilistic ideology par excellence, that seeks not simply to tear down but to destroy everything and everyone with whom it crosses swords, which is anyone, everyone and everything that does not share its extremely narrow and equally perverse Weltanschauung.