Well, all we need to do is force Europe to embrace their Christian culture again. Do essentially what Charles Martel did with any armies he defeated: Spare them only if they convert to Christianity, or else they’re dead. And anyone who adheres to Enlightenment values, bam, they get a bullet in the head, and then ask if anyone else wants to follow in their example. That should work in getting them back on track.
A bullet to the head? I can’t see that bringing anyone to Christianity and worse, how would that separate Christians from Muslims when we are using the same “convert or die” mindset of the Muslim? Islam spreads by the sword, Christianity spreads from heart to heart through love and peace.
Europe is beyond help, and we are moving in the same direction. We will not be able to fix someone else while we remain broken ourselves.