I guess you "forgot" that Peter was the one chosen to be the first pope by Christ himself?
"Thou art Peter and on this rock, I will build My Church and the gates of Hell shall not prevail against it."
I think you've forgotten what Peter had literally just said before that.
Matthew 16
13 When Jesus came into the region of Caesarea Philippi, He asked His disciples, saying, “Who do men say that I, the Son of Man, am?”
14 So they said, “Some
say John the Baptist, some Elijah, and others Jeremiah or one of the prophets.”
15 He said to them, “But who do you say that I am?”
16
Simon Peter answered and said, “You are the Christ, the Son of the living God.”
17 Jesus answered and said to him, “Blessed are you, Simon Bar-Jonah, for flesh and blood has not revealed
this to you, but My Father who is in heaven. 18 And I also say to you that you are Peter, and on this rock I will build My church, and the gates of Hades shall not [
g]prevail against it. 19 And I will give you the keys of the kingdom of heaven, and whatever you bind on earth [
h]will be bound in heaven, and whatever you loose on earth will be loosed in heaven.”
20 Then He commanded His disciples that they should tell no one that He was Jesus the Christ.
21 From that time Jesus began to show to His disciples that He must go to Jerusalem, and suffer many things from the elders and chief priests and scribes, and be killed, and be raised the third day.
22 Then Peter took Him aside and began to rebuke Him, saying, [
i]“Far be it from You, Lord; this shall not happen to You!”
23 But He turned and said to Peter, “Get behind Me, Satan! You are [
j]an offense to Me, for you are not mindful of the things of God, but the things of men.”
Yeshua's church is built on the fact that He is the Christ. Without that, it's just a Jewish sect.
And Peter is some Pope. He makes the statement on which Yeshua says He will build His church, then turns around and allows Satan to speak through him, very soon after supposedly being made Pope. Since the Pope is supposed to be infallible, how can he be so wrong?