***Jesus also called him Satan in that same conversation.***
Yes, Jesus did say to Peter, “Get behind me, Satan”.
Peter, not wanting Jesus to die, tries to deny what must happen. Just as Satan would like us all to do, deny Jesus, deny the Incarnation and deny our redemption from the cross.
It actually is a very telling incident.
We enter the gates of heaven through the Truth of Jesus.
Conversely, we enter the gate of hell through the lies of Satan.
What does Jesus say? “I will give you the keys of the kingdom and the gates of Hell will not prevail against it.”
And what happens next? Peter is immediately attacked by Satan and Jesus just as immediately steps in with the truth and further teachings about giving up one’s life for the truth.
Peter was indeed human, with a fully human nature that could fail, but the human Peter, united with the Holy Spirit was a totally different creature.
Just as we see in Jesus the union of the human with the divine, we see this union in Scriptures, written by humans under the inspiration and guidance of God, and the Church, led by humans under the inspiration and guidance of God.
Your religion had zero to do with writing the scriptures...The scriptures condemns the existence of your Church...