Father Fessio,SJ of Ignatius Press has proposed this thought experiment. Let us say that Pope Francis were to get married and announce that the Muslims were correct all along, and there is no God but Allah. Would he cease to be Pope? Considering out current hapless bench of Bishops, better questions might be how many Bishops would remain totally silent and how many Bishops would be singing the praises of the Pope for his brilliant development of the Christian faith?
Prior to the current Pontificate I would have regarded Father Fessio’s hypothetical as absurd. Now, nothing, up to and including a Pope proclaiming himself a Satanist or an atheist, would surprise me.