I'm being unkind by telling the truth? The Roman Catholic Church has really only existed, as it is currently known today, since 538 AD, when the RCC took control of Rome and much of the Roman empire. The church in Rome corrupted Christianity by the accepting of man's apostate/pagan traditions over Biblical based principles described in the Bible, which was defined before the RCC's claim to the sole authority on "christianity". The RCC during the time of its greatest power, restricted the the Scripture, and changed the definition of of Scripture, saying that scripture can only be interpreted by the Church. RED FLAG!
The RCC does NOT define Christian Canon, no matter what they claim. The RCC defines "catholic canon". Because of the supression of the Word of the Lord for so many years, and the generaly illiteracy of the times, that the true Christian Canon did not materialize again in a form that the common people couild read until Luther and the reformation. So, the fact that RCC held onto these beliefs years and years before the Protestant Reformation, has no bearing on the correctness of said belief.
That's according to one belief system.
An alternate view is that the Roman Catholic Church saved more souls by adapting their pagan traditions to Christian beliefs, thereby making the transition from pagan to Christian less traumatic for the masses.
I'm sure there are any number of other explanations, and I'm sure each and every proponent of each and every faith firmly believes he or she is absolutely correct and everyone outside that faith is dead wrong and on his way to Hell (or wherever nonbelievers go).
Could we just go back to talking about ETs now?