I disagree with the title. The enemy in many ways is us. Until we are able to combat the lunacy that pervades the halls of Washington DC such as ISIS needs jobs, we will never be able to combat the real terror. That of Islamo Fascism.
There are enemies both foreign and domestic.
If the civilized world is to survive, it must recognize Islam for what it really is: It’s not a religion, form of government, or anything recognizable to the civilized mind. Islam is a disease, an incurable disease of the mind that is highly contagious among the feeble minded and is now spreading among the world’s feeble minded at an epidemic rate. As with any disease, one can’t reason with this disease, negotiate with it, or treat in any manner other than how one would treat any other incurable disease.
Past efforts to contain this disease have failed. Now, carriers of this Plague of Islam must be eradicated wherever they're found, for if they're not, this disease will eventually end not just Western Civilization, but it will undo over 5,000 years of human civilization.