17 Jesus said to him in reply, "Blessed are you, Simon son of Jonah. For flesh and blood has not revealed this to you, but my heavenly Father.
18 And so I say to you, you are Peter, and upon this rock I will build my church, and the gates of the netherworld shall not prevail against it.
19 I will give you the keys to the kingdom of heaven. Whatever you bind on earth shall be bound in heaven; and whatever you loose on earth shall be loosed in heaven."
And the gates of the netherworld shall open against other churches? Because, according to Catholicism the Apostle Peter is first Pope and Catholic Church is one true church.
But, historically, Orthodox Church are founded by the Apostles including St Peter. Still they aren’t Christ’s church? Why? Are they also Christ’s Church and/or immortal against the netherworld?