To the extent that they are Muslims and they are driven by mostly chaotic evil.
But if you're going to split those hairs for rhetorical purposes, here it goes:
Islam is not a threat because the vast majority of Muslims are peaceful and do not participate in violent jihad.
Jihadism is not a threat because most Jihadists are not actively engaged in warfare against the West and those that are have limited resources with which to act.
And Daesh is not a threat, despite its proliferation, because it lacks the capacity to project anything outside its own borders other than propaganda.
Nor even a UNIQUE threat. Strictly speaking, the Daesh isn't even a threat to the U.S. and Europe; they're a threat to Syria, to Iraq, to Turkey and Iran
The are a threat right up to the place where people take up arms and stop them.
Which has already happened, hence the end of the threat. The problem is a lot of the people who were SUPPOSED to take up arms (e.g. the Iraqi Army) didn't bother to and Daesh moved in virtually unopposed.
Plus a few mass killings outside that boundary, if you consider that sort of thing threatening.
I consider it criminal and preventable. Hardly "threatening" from a national security standpoint.
I think Barbos had it right. As far as the Daesh and Al Qaida, Islam isn't a threat, it's a giant pain in the ass.