God already revealed his truth to the first 12 apostles and those 12 ordained other disciples to preach the same truth.
God did all this in the early Church and that's whom he also choose to compile the Bible.
then the protestants started removing books from the Bible more than 1000 years later, that's why you have 66 books only and that's why you don't understand the catholics and orthodox, because they have more books than you, its simple actually.
I would rather trust the doctrine of the early church, than trust anything anyone say today, there are litterally million doctrines today in the protestant church, that's why there are so many denominations, no one agrees on anything, and you have to ask yourself wether that is from God, but I don't want to insult your intelligence level, so I think we can both agree that it isn't.
we are supposed to be one church, with one main doctrine.
Eph 4:5 One Lord, one faith, one baptism,