When you kick the Triune God out of your nation, it will suffer. Without the Christian gospel lifting civilization, it will again descend into another dark age.
“Righteousness exalts a nation, but sin condemns any people.” Proverbs 14:34
They can take their religious pulse until the cows come home, but their movement away from Christianity has left a huge vacuum... and one particular vile cult will be filling it.
Very soon secular progressive Euro-elites will wake up to the slow-motion cultural suicide their multicultural FAIL is leading them into. They will quickly realize that the only way to counter an fatal cultural infection that is rooted in religion is with another religion. And that means a political reason to revive the role of the Roman Church in the lives of Europeans. All this was foreseen long ago.