Please stop saying that Protestants engaged in a novelty by tossing out seven books of the Bible that until then Christians had always treated as part of it. That is neither true nor fair.
Recently a friend of mine posed the question of whether or not it might be acceptable for any reason to add to the sixty-six books of the Bible. As you will likely be aware, the canon (i.e. the list of books that belong to the Bible) used by Protestants contains sixty-six books, but the canon used by Catholics contains seventy-three books. It didn’t take long for a Catholic friend of my friend to arrive on the scene and to reject the presupposition that the Bible contains sixty-six books: