The Roman Catholic insistence that one man speak for all of Christianity is very odd, to say the least.
Odd? Where in the history of God dealing with man did he ever assign a committee?
There was one man, Adam, to whom he gave the fate of Man.
There was one man, Abram, who was called from the land of Ur.
There was one son who followed Abraham and Isaac was only able to bestow a blessing of inheritance on one son.
Then there was the model of equal sons (twelve) and bondage and slavery.
There was one man, Moses, who lead them forth from that bondage, ascended the Mountain of God and received the Law.
Moses had one successor, Joshua.
Upon the death of Joshua, the tribes again governed themselves and the nation of Israel struggled so that God had to raise up judges, again One at a time.
We raised up one King, David, to lead the nation of Israel into peace and prosperity. When division came, so war came again.
In the fullness of time, it was through one man, the seed of David and Son of God, through whom salvation came.
Upon his departure (according to our doctrine) he left the responsibility for the Church in the hands of one person who has handed it down ever since.
You find this last one odd? That is how God rolls, historically speaking.