As God wills.
Perhaps the first step in a Christian revival of Europe is to rid the mind of meaningless ritual and superstition that points away from Jesus Christ alone.
"Create in me a clean heart, O God; and renew a right spirit within me." -- Psalm 51:10
Respectively, a question. Did not Luther post his thesis around 500 years ago (1517)? Does the “first step” take that long?
Right.
Catholic Europe is going to crumble and will be replaced by a joyous Protestant springtime in which Europe's citizens will spontaneously embrace the spiritual heritage of Luther, Calvin and Zwingli et al.
What planet are you on? Does joy over what's happening to the Catholic Church in Europe blind you to the bigger picture on that continent? Europe is in the middle of a great apostasy and is casting off its Christian heritage (indulge me a little here and allow me to include the Catholic Church as part of the "Christian" Church). In the short and medium term, there is going to be no Christian revival in Europe, Catholic or Protestant, got that? There is going to be an Islamic onslaught which will blow away all the nominal, lukewarm and newly apostate former believers of all stripes.
What comes out of that is open to debate but I'll bet my house it won't be a Calvinist nirvana.
So if we lose 100 million Europeans, just remember that China is now 10 percent Christian (100 million) and rising.
The church will survive, even if Europe apostasizes.