The Catholic Church was and is the Church founded by Christ. It was to Peter that the promise was made in Matthew 16:18-19
18 And I tell you, you are Peter, and on this rock I will build my church, and the powers of death shall not prevail against it. 19 I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven.”
When heresies abounded, it was the See of Peter that remained strong when others faltered and compromised.
Though many have broken communion and many have lost faith in what has been promised, I remain with the Roman Catholic Church. If it has failed and taught error, then Christ’s promise has failed and it indicates Christ is not God.
If that is the case, then our problems run all the way back to the beginning, and we may decide whether to be Jews or atheists.
But I have faith that Christ is God and Rome is not wrong despite what others might claim.