A complete, and 100% correct, answer to 'How Islamism is Fascism?'. The answer was given by, of course, VDH.
...the methodology of violence is similar: The use of murder, suppression of dissent, and cult of the personality all used for centralizing power in a mythical strongman. And if we can believe his boasts about what he wants to do to the US and Israel, then we can see an embrace of genocide as well, his problem being only means not intent.
Go read the entire answer.