When The Catholic Church Began

When the Catholic began was when Peter was given the keys to the kingdom by Christ himself. Christ knew there would be divisions, so he left authority and promised that the Holy Spirit would not let the Church fail. Today some who don't like church leaders or a particular Church teaching believe the Catholic Church is either in error or not the Church Christ established. Ironically they ignore the very words of Christ himself, who promised

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. — Matthew 16:17

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." Matthew 16 19

How Other Churches Began

All other Churches were founded after the Catholic Church by men who had disagreements with the Catholic Church.  In Matthew, we read how conflicts should be resolved.

If he refuses to listen to them, tell the church. If he refuses to listen even to the church, then treat him as you would a Gentile or a tax collector.  Amen, I say to you, whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven. —Matthew 18:17