Could Jesus, the 2nd person of the Holy Trinity, the Son of God and truly God Himself actually turn over His church to a human being? Could a human actually be trusted with a new society that is designed to change the moral climate of a civilization? The answer is certainly yes and with that persons name is Peter. His good fortune was that the weight of this responsibility did not have to solely rest upon his shoulders. Jesus told him that the He would be with him till that the Holy Spirit would led, guide and teach him all things pertaining to this new society called The Church.
It just does not seem reasonable that God would go to the lengths of humiliation, scourging, beating and ultimately death just to say to a fisherman from a small sea town the following definitive statement "...thou art Peter; and upon this rock I will build my church, and the gates of hell will not prevail against it" Mt. 16:18
Is there a biblical premise for this kind of confident impartation of authority, administration and authenticity from God to man? Yes? See Isaiah 22:18-23 "In that day I will summon my servant, Eliakim son of Hilkiah. I will clothe him with your robe and fasten your sash around him and hand your authority over to him. He will be a father to those who live in Jerusalem and to the people of Judah. I will place on his shoulder the key to the house of David; what he opens no one can shut, and what he shuts no one can open. I will drive him like a peg into a firm place; he will become a seat of honor for the house of his father. All the glory of his family will hang on him: its offspring and offshoots—all its lesser vessels, from the bowls to all the jars"
The richness of the Old Testament is revealed in the New Testament and often serves as an example as noted in 1 Corinthians 10:6. The person of Peter is spoke of approximately 170 times and the one who stands as having primacy over all the bishops of the church. His authoritative position has remained in tact despite and human failings...and there have been and will be many of them.
In recap; Unreasonable? Yes. Truly miraculous; Yes!!! True? Yes!!!