That it is second to the Church and that the Church teaches things quite independent of it. Their information is mistaken, but their motives are high. In fact, given this mistake, their criticism is admirable. But we must now look at the mistake. The clearest litmus test to distinguish the two is their attitudes toward the Bible.
Modernists reduce the Bible to a human book.
Because they dis-myth the Bible, let us dismiss them for now and explore the dialogue between orthodox Protestants and Catholics. It is important to begin with experience, with the spirituality of the Bible, for this is the key to understanding the beliefs about it. First of all, it is sacred. It is God's word to man, not man's words about God. In it God spoke and continues to speak, not only to humanity at large but also to the individual.