The correct term is "Islamic Fundamentalists". The incorrect term "Islamic fascists" implies that the evil of the ideology is some alien thing that was arbitrarily grafted onto Islam by European outsiders.
I like Islamic Fascists better because the term you state as correct is closer and sounds like term "Christian Fundamentalists" and that is a problem
The Left wants to create a moral equivalence between conservative Christians and Radical Islamic fascists.
The truth is that Christian Fundamentalists are not running around blowing up innocent people or beheading them.