It's great that you disagree, but it means a lot that you say "you can understand" the RCC position.
My point to Starman, etc. is if God can protect the integrity of His word for the first 100 years via Tradition, it stands to reason that He could do so for 2000 years, as the Catholic Church says.
I agree that the Early Church Fathers are a valuable source of info, without being inspired. Moreover, it is interesting to note what ECF's have to say about various doctrines that the RCC is accused of making up hundreds and thousands of years later, for example the Eucharist.
Even if a person ultimately does not agree with the doctrine, their writings prove that such teachings were around long before Fundamentalists think they were.