What do you think about this quote of Frederick Copleston ( priest, philosopher, historian of philosophy)
"It seemed to me that if Christ was truly the Son of God and if he founded a Church to teach all nations in His name, it must be a Church teaching with authority, as her Master did. Obviously one might deny that Christ was the Son of God, and one might reject the claim that he founded a Church. But if these two claims were accepted, it seemed to me that in spite of all its faults the Roman Catholic Church was the only one which could reasonably be thought to have developed out of what Christ established."