It's already begun. It's called the War on Terrorism.
Europe,Asia,U.S.,etc all need to fight against terrorists and the expansion of terrorism, just as we've had to fight against the spread of communism.
There is no war on terror. US still support Terror states: Saudi Arabia, Pakistan, Egypt, KLA. Russia: Iran, Syria. France: Sudan, Syria, etc. Point is: there can be war on Islam, that would win...but beside Yeltsin in rare sombor moment (when he state that ISlam is cancer of the world) no one in West will say it as it is.