militant radical Islamism seems to consist largely of isolated small groups gathered around so-called Imams
It might seem so to you, but that is shite.
Have you never heard of Al Qaeda, Taleban, Al shabab, Boko Haram, the recent war in Chad,.....
I did suggest you try looking it up Don, but you chose to demonstrate your profound ignorance to the world again.
I was being nice to you, silly.