The facts and truths established by Science are no longer made the subject of attacks by Christian apologists in the manner that they used to be; they are now considered by them to be the unfolding, through God's Providence, of pieces of information hitherto concealed from us. A scientific discovery (by men who are more often than not Agnostics) simply means that God wills to reveal another detail of His eternal methods. There must be, we are told, a frank modification, or even the abandonment, of certain preconceived ideas which, faulty as they were, had sufficed for man in an earlier stage of his development, and had come to be regarded as integral parts of his religious faith. This is the substance of the modern apologist's argument which is intended to reconcile all outlying discrepancies between our new knowledge and our old beliefs. The new explanation, based upon the assumption that revelation is progressive, will come as a surprise to the rank and file of Christendom, who have hitherto been given to understand that the Bible contained the one, only, and sufficient revelation of God to man. However, there is no alternative. If accepted, many grave difficulties of faith are swept away. Nay, more; the reasonableness of our faith is immensely strengthened, and the facts of science and research become a valuable adjunct to the armour of the Christian apologist. On the other hand, a refusal to accept spells disaster to the Christian faith. The truth of progressive revelation is, therefore, a matter of life or death for the Christian religion; and, of all branches of modern research, it is Comparative Mythology which absolutely demands the complete establishment of this theory. If true, our belief is further verified by the startling discoveries of the ethnologist; if untrue, it is irrevocably shattered. Accordingly, in this chapter I am giving a prominent place to the discussion of this theory.