This is where we disagree. I can't go to sleep at night believing that God sent a false Vicar to His Church. Vicar=representative.
I have wrestled many times with Ladislaus's position of sededoubtism, but I only end up with a possibility vs certainty that God sent a false Vicar.
Don't believe that God would ever deceive...
Lets face in order to have a deception, there would have to be a line a false popes? Right?
Most, if not all the confusion, accusations, opinions etc. regarding the popes' status stems from a false idea of papal infallibility, then mix in a whole lot of papolatry - as AES exemplified with his "being subject to the pope is being subject to God". This is not Catholic, this is pure papolatry and is prevalent in varying degrees in probably all sedes.
God did not send a false Vicar, the pope is the Vicar of Christ on earth and he was elected, perhaps sent by God, certainly God permitted it. The faithless population got what they wanted, perhaps what they deserve. But either way, our salvation does not depend on his sanctity - recall in 1917 the Fatima Children saw souls falling into hell like snow flakes in a terrible blizzard - that was when a "true" pope was in the chair.