Actually, I think there are AMPLE examples of where Catholicism makes things up as they go — Mary was sinless (when Scripture says otherwise), Peter was the first Pope (which Scripture clearly does NOT say), one should pray to the dead (Saints — but only those declared so by the RCC), oh, Catholicism is just FULL of things they have made up and which cannot be found ANYWHERE in Scripture, so nice attempt at diversion, but sorry, no, it’s not Protestantism that engages in that kind of circularity and historical revisionism. Catholicism is the religion which proclaims its doctrines to be authoritative because....well, just because, don’t you know.
This is exactly what I'm talking about: you can't even seem to get it through your head Catholicism does not maintain the Scripture is the sum total of special revelation from God, therefore, we are not required to find each and every doctrine explicitly outlined in the Scripture as Protestants erroneously claim to do.
Catholicism recognizes the Bible is a product of the Church, not the other way round.
Don’t forget transubstantiation.