The book tells the distinction between the Doctrina Christiana, the book that was first published by the European colonizers in the Philippines, and the Biblical Doctrina Christiana, which contains the law of God and Christ. With these revelations, it is divulged that the said book, which contains the Catholic Creed, does not embrace the teachings of God and Christ but all conceptualized ideas of mere men bearing the virtues of man for the followers to obey. Through this exposition, rectification of the book with mistakes suggests adherence to the biblical doctrine that many will be enlightened and saved.