Bill---this "root" goes back 1400 years and Islam has not had it's own internal "reformation" as the Catholic and Protestants did say during the 100 and 30 years wars on central Europe that left entire areas devoid of human life. Once both sides realized that there were virtually no human life left in the contested regions did they finally come to an agreement.
Right now that single "root" ---the dispute over the killing of Hussein and who was to follow in Mohammad's footsteps will "haunt" the world until they finally settle the issue but in order to do that someone with religious authority on each side has to step up and lead but in Islam there are any number of Mullahs/Imams "wanna be leaders" with countervailing views which was not the case in the Catholic and Protestant wars which tended to singular leadership.
Layer then this deep problem over the issues of power sharing, revenue sharing, regional hegemony and one has the makings for a really long time conflict and the price of oil at 115 USD per barrel which will then slow down a large portion of the world's economy leading thus to other issues.
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