Christians are the majority in some parts of Europe, not in all - in the UK for instance, teh majority are non-believers
Lebanon was originally meant to be an eastern Christian homeland, and there once was an Alawite state. As for the Yazidis, they’d probably be model citizens on any continent, once they learn about flush toilets and such.
England might be mostly lapsed Christians, but they pay taxes to support the Church of England, and each citizen belongs to a parish, so the mechanism is in place for a revival. What they need is a new sort of politician, a cross between DJT and Winston Churchill, to replace the rabid poodles of Labour and TINOs like May.
So Syria could be carved up between the Christians and the Alawites and the Kurds in an ideal world. But neither Assad, Hizbollah, Russia or Iran will hear of it.