Catholic Church drives its authority on one verse in the bible:
Mt 16:17 17 Jesus replied, “Blessed are you, Simon son of Jonah, for this was not revealed to you by flesh and blood, but by my Father in heaven. 18 And I tell you that you are Peter, and on this rock I will build my church, and the gates of Hades will not overcome it. 19 I will give you the keys of the kingdom of heaven; whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.” 20 Then he ordered his disciples not to tell anyone that he was the Messiah.
With this verse on hand, they argue:
1. They are the very church established on the foundation of Apostle Peter.
2. The church was given authority to forgive sins.
I would like to think about the truth one by one.
There are two errors in this argument.
First, consistently the bible says that only God has all the authority for the forgiveness of sins, no other ones.(Luke 5:21) And Jesus had the authority (Mt 28:28) because he was God himself. And he did not give the authority itself to the disciples. We can confirm this through the examples of apostles. After healing a crippled man this is what Apostle Peter (Who the Catholic puts its authority in) said:
Acts 3:12 When Peter saw this, he said to them: ”Men of Israel, why does this surprise you? Why do you stare at us as if by our own power or godliness we had made this man walk?
When they saw the miracles done by the apostles, people thought the apostles have the power and authority to do those things. But Peter clearly testifies that the power and authority do not come from him, rather only from God and Jesus. Over and over again they say that the authority comes from only God and they are only man. (Ac 10:26, 14:15) But then how can we explain what is happening here? Simply put, when a child was hurt by a bad man and the child who got hurt says that he does not want to punish the abuser, the parents listen to the child and do not punish him for his wrongdoing. It is not because the child has authority for the lawsuit, but because the parents who has authority listened to the child and forgave the man. It is the same with Peter and Jesus. The authority for the forgiveness was not in the disciples, but the sins could be forgiven through disciples because Jesus is listening to them and also the Holy Spirit was guiding them directly so that they can know what is right and what is wrong.
Second, Catholic insist that they are the true church established by God on this earth. But if we take a look at the church history the church established by the Christ was the church of God. Before it was called in present name, Catholic was also only one of the churches of God during the Apostolic time. It was not the only church. And later even though other churches of God followed command of Jesus, but the Church of God in Rome (or Catholic) began to change the words of God and it became the very first church which deserted Christ and fell into the teachings of man. That false church later destroyed all other true churches of God during the dark ages and it was the only one left behind. It seems like an illegitimate son kills all the lawful sons and after that he is calling himself I am the only legitimate son and give me all inheritance. But people knows that Catholic is not. It is just a false one which acts like a true one. Now time has come for the true sons of God be revealed and it will lose everything and will have to give it to the real son.
Give all glory and thanks to God Elohim who is the only one who has authority and power.