The problem with Islam is that it provides a framework and a touchstone for people who wish to engage in this activity. What do you suppose is said in the mosques?
While there was separatist sentiment in the Panthers (according to David Horowitz in his book "Radical Son", and he would know because he was there) the Panthers did not hijack airliners full of people, kill the pilots and fly them into buildings killing thousands.
The Panthers did not strap explosives to themselves and walk into crowded wedding receptions and blow people into small pieces.
Panthers did not capture defenseless innocent people and slowly saw their screaming heads off with long knives, while chanting how great their god is.
That is why it is different. Everything changed on 9/11. I don't think the religious component is overdone, and I think it is a grave mistake to discount it.
I doubt what is said in Mosques is to street riot. I really don't. I suspect the perps are not very religious at all. The are party time punks. They probably drink.