It's not about religion!
As Bill said rather succinctly. That is spin. Think mafia, KKK, Hitler Youth, the clinic bombers, or even Rev Foulwell: if he had at his disposal say Suicide Crusaders for Christ -- it isn't Allah against JC: that propaganda is patently about recruiting the impoverished and naive - and especially those raised by parents who would use them as weapons, and say it is for God (and some virgins, later).
No holybook writings have *anything* to do with this war and its tactics: guerilla VS techno-power / 3rd world VS Rich world.
Had 9/11 not happened, we would (as all time previously) remain totally uninterested in the 'faith' or plight of these opponents - they are losers by our standards, too poor to matter: because they cannot do bizness with us. That is our main 'interest' in Any other group or nation. Clear?
All the rest is spin, propaganda for recruiting as many guerilla expendable troops as they can / bucking up our boys n' girls to defend our wealth. Our opponents may settle for merely destroying as much of our wealth as possible; this because: they realize fully that, they are impotent to take it in the usual ways of warfare! Thus - their job is much easier, as is their minimal strength leveraged by three main facets:
1) Via their stealth and anonymity: we must waste huge efforts to find them individually.
2) As it is impossible to 'harden against attack' an open society: their targets are manifold and largely vulnerable.
3) Via exploiting the religion concept to galvanize normal people to commit suicide (for fantasy rewards and evocation of moral fervor) - their access to targets is further magnified.
You will find it easier to keep score and do armchair quarterbacking as the Tee Vee War is rolled out before us all, replacing the daily soaps: if you do not continue to imagine that this has anything at all to do with Truth Beauty and Righteousness (as in: picking the god which will support Your side\ufffd, kick other side in teeth.)
HTH
Ashton