It may say that but it doesn't mean that they really follow it. The only unanimous consent (and even that is questionable) has been on the articles that make up the Nicean Creed. Even with that creed there is disagreement with the Eastern Orthodox over what is called the "filioque" where the wording about the Holy Spirit proceeding from the Father and the Son rather than from the Father is changed. On the issue of the Canon of Scripture from Trent, we know that there was MUCH disagreement on the formal inclusion of the Deuterocanonical/Apocryphal books to the Old Testament. Saying that doctrines meet that test and actually proving that they all have is hard to do.