Actually you mean radical islamism. It is strange that some of these countries putting out combatants - Indonesia, Saudi Arabia, Malaysia, Egypt, Jordan, and others - were at onetime strong allies of the US. At least for appearances sake. When they saw back in Somalia in the early 90's that casualties made for bad television as far as Americans were concerned, they knew they had an edge. And apparently American's can't take five minute segments of military casualty counts from Iraq.
The way things are going, they think they can win before we get up from the couch to go back to the fridge for more snacks.
No, I mean pan-islamism. Look it up.