So, doesn’t “the question of the future of Christianity” seem like a strange question? Shouldn’t it seem strange?
Considering that Jesus Christ is head of the Church, and presumably all things are going according to God’s plan for the fullness of time?
Unless we don’t really believe that?

Image: “Calendar below the Prague Astronomical Clock,” Filip Maljković from Pancevo, Serbia, CC BY-SA 2.0, via Wikimedia Commons