My Exodus - From Roman Catholicism (Paperback) - by Bishop Paul De Ballester

I realized at that point that in order to purify his faith, any thinking Christian of every other denomination faces the need to reject some element of the teaching of his faith-group that conflicts with the overarching teachings of Christianity. The only exception to this is the Orthodox Christian – only his beliefs constitute the pure essence of Christianity, the complete, eternal, and immutable Truth, as revealed by God Himself in the Gospels. A Roman Catholic, for example, can reject the pope as I did, recant the teaching on purgatorial fire, or argue the terms of the Synod of Trent without losing his Christian identity. Similarly, a Protestant may reject the teachings of the reformers regarding divine grace and predestination and still be a Christian. Only Orthodoxy has not incorporated any external elements, so that every single item of its faith is an essential and unaltered truth, impossible to reject or excise. The Orthodox Church is the only Church that has never attempted to suggest anything other to the faithful than that which always, everywhere, and by all has been considered to be the God-revealed Truth through Jesus Christ.