To all of you arguing that this isn't about politics, you should be aware that muslim fundamentalist movements came to power by sole virtue of oil exports, not because they actually managed to compel a large mass of people to commit themselves to strict religious doctrine.
ISIS itself was able to become such a large organization by smuggling oil into Turkey, as much as Ahmet cries that it's all lies (the UN had been issuing warnings about ISIS oil smuggling for years now). People are primal, they are attracted to riches and wordly pleasures first and religious illumination second. If ISIS has no shortage of people wanting to fight, it's because ISIS has no shortage of money to pay them for it and thus muslim extremism is as much of a geopolitical issue as it is a religious one. If niether ISIS nor wahhabist leaders had no money, you wouldn't be hearing about them.