Dear Rich D.
Why do "(Almost) all Christians accept the Nicene Creed" when it is an extra-biblical concoction created centuries after the books that these same Christians accept as in the Bible canon were written. Is the Nicene Creed part of the Bible, a book within the Bible? No. Do "(Almost) all Christians also tell Mormons that one cannot add to nor take from the word of God (Even though "(Almost) all Christians" accept an extra-Biblical creed as the one mark of their common Christianity. And who is it that is preaching another gospel again?