The Catholic Church officially teaches that Christians outside the RCC are part of the RCC whether they fully realize it or not, although not perfectly (to say the least). The RCC gave the world Christianity (I've studied early Church history...). But if a person disagrees with a dogma taught by Christ's Original Church, which is a teaching set in stone, as it were, that person is wrong and depending on the issue at hand.. maybe wrong enough to end up in Hell.
The RCC isnt the original Church as you claim, this could be found in Jerusalem in Acts 2
The believers were first called Christian's in Antioch Syria, a far stones throw from Rome, Acts 11:26
Jesus Is The Lord