It has had nothing to do with Wahhabism or the KSA---it has been all about the Shia Sunni split and the drive between Iran since Khomeini to expand Shia influence inside the Muslim world which clashes with that of the KSA and their defense of the Sunni global community and then in turn the regional hegemony clash between both Iran and the KSA.
The use of Wahhabism was the KSA attempt to control that Sunni global community and at the same time encircle the Shia global community with what they viewed a purer form of Sunni Islam.
Actually the KSA has been over the last ten years backing off (have actually cut back their funding and training enters) of the deep Wahhabism global drive but in the end has been supporting the AQI in Syria due to the Shia Sunni conflict.
Right now there is an estimated 3K Saudi's (many former military trained types) fighting with the IS and the KSA has broken up a large IS cell recently inside the KSA.
The IS has been actually threatening the destruction of the twin holy sites in the last week as they now view the KSA as not being radical enough--actually they do not view the KSA to be Takfiri enough for them. There is some indications in informal polling that the young generation inside the KSA are now more and more identifying with the IS and their messaging. By the way Wahhabism is not the same thing as Takfirism inside Sunni Islam.
Check the IS Caliphates' map they released when they called out the Caliphate---they are taking Islam back to the golden age of the expanded influence they had in Spain, North Africa and the Arabian peninsular and that appeals to the young Muslim of today.
IS has now become a direct threat to the KSA as well as a direct threat to Iran due to their deep Salafist hate of the Shia and any other religion that is not Salafist.
This is not a Christian Islam thing ---it is a pure Sunni power politics debate for the heart and soul of the Sunni global community.
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