You know, I've always wondered about that. But if that is true, would it not invalidate that in Mathew it says even Hell could not prevail against the Church?
No, the Church would have continued, we just would have seen a second wave of martyrdom that far surpassed that of Apostalic times. It wasn't so much that the Pope was afraid the Church would be destroyed, but that there wouldn't be anyone around to do the good work (remember that a LOT of Jews were being saved directly through the Vatican) if they were flattened under Panzers. One of the points of an underground railroad is to not
draw too much attention to yourself.