We cannot defeat the Islamist threat without the same degree of faith fanatical Muslims have. That is why most Europeans have capitulated to the anti-liberty Muslims in their midst and to the Muslims in the Middle East who seek to annihilate Israel, the state in their midst that venerates liberty.
But in Israel, the Islamists have come upon an enemy many of whose people believe in their religion as deeply as the Islamists do in theirs. This is a major reason Israel is isolated along with America as the Islamists' main enemy. America and Israel have believers. The defeat of one or the other will render the Islamists' goal -- a Muslim world governed by Islamic laws -- probable, if not inevitable.
That is why this battle is a battle of civilizations. One civilization believes in liberty and one does not. The problem is that the civilization that has liberty has not produced anywhere the depth of belief in liberty that the opponents of liberty have produced. That is why most Europeans (and their supporters in America on the Left) see dying or killing for almost anything as pointless. When you don't believe in anything except not dying, you don't really believe in anything. For this reason, European civilization is in peril.
The great question mark is America. America is already in the midst of a civil war, thankfully still non-violent. It is between those who fervently believe in America and in Judeo-Christian revelation and those who fervently believe in neither.
If the former win, the Islamic totalitarian threat, like the totalitarian threats before it, will be vanquished. If the latter -- as represented by the Left, many Democratic Party leaders, pacifists, the cultural elite, and academia -- win, liberty will have been nothing more than an aberration that lasted a few hundred years.