Yes but only in the sense of anyone with a weapon and willingness to use it is a threat.
ISIL is simply the latest boogeyman threat. Prior to them it was al-Qaeda. Once the public got desensitized to them, a new enemy was needed to justify continue aggression in the middle east by western powers. So voila' ISIL.
Important to remember that when the people who made up ISIL originally were fighting the Assad Syria regime, the US liked them just fine. But when they started widening their area of operations suddenly we didn't like them any more.
Can google pics of US leaders posing with ISIL fighters when they were still all about Assad. Just like there are pics of Cheney with Saddam Hussein and such. All these enemies were once US allies and friends.