How dangerous is ISIS and should we really be worried?

Are they at some point really coming into Europe and America etcetera... is it really that dangerous? Or will a bunch of terrorists lose it vs real army´s in the end? I really wonder. freaks they are.
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And really...´´Islam is peacefull and a harmonious religion´´ but in the meantime, they throw gay people down the roof, burn people, cut heads of... VERY peacefull yes. Those guys are terrorists, beasts and NOT Muslims!
How dangerous is ISIS and should we really be worried?
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