Fanatical MUSLIMS created isis and nearly all the other terrorists. It's only hard to understand if you're not paying attention.
But as much as the world hated Saddam, he kept the Islamic extremist in tact. He kept them out of Iraq and his secular regime. He only called out to Allah when his neck was on the line. Bush looked at the short term solution, not taking into account the fact that the evil Saddam was keeping the greater evil Islamic terrorist under control. The 2003 invasion opened Iraq to any and all terrorist to call it home. al maliki made matter worse when he turned his back on the Sunni population and provided the greatest reason for recruitment into groups like ISIS.