The reference below is partly right. Israel is not to blame for everything.
How We Know ISIS was ‘MADE IN THE USA
Phi Beta Iota: Saudi Arabia is the primary actor behind ISIS, but they paid the Clinton Foundation tens of millions of dollars to assure that Hillary Clinton, and their de facto agent of influence John Brennan at CIA, would move US treasure, blood, and spirit in their favor. Israel always encourages the Balkanization of the Middle East, but on Syria (and Yemen) this is about the Saudis wanting pipelines to the northwest and southeast.
See Especially:
Mongoose: ISIS @ Phi Beta Iota