While...
Presenting a Catholic pope as an authoritative source in contravention to BIBLICAL teaching and expecting rational people to accept it is a fools errand.
the pope is indeed biblical, "on this rock I will build my church", feed my lambs, feed my sheep....etc etc etc etc. for 1,600 years christianity accepted the pope as titular head of the church....but along came the protestant bunch (Luther et. al.) and decided they they knew better that Christ and 1,600 years of tradition....O.K. I guess, but I'll stick with Christ and HIS church.