I’ve read the statement that while not all Muslims are terrorists, all terrorists are Muslims. Not so!
The terrorism of the 1970s was spearheaded by left-wing radical extremists such as the German Red Army Faction and the Italian Red Brigades. The Oslo bombing and Utøya Island massacre was carried out by a lone anti-Islamic fascist.
Terrorism is a tactic that can be, and is, used by people with all sorts of beliefs.