This is Life!: Revolutions Around the Cruciform Axis

C S Lewis, "Priestesses in the Church?"

I found Lewis' insightful essay on the net. You should read the whole thing. You can go to it here.
These two paragraphs are representative:

Now it is surely the case that if all these supposals were ever carried into effect we should be embarked on a different religion. Goddesses have, of course, been worshipped: many religions have had priestesses. But they are religions quite different in character from Christianity. Common sense, disregarding the discomfort, or even the horror, which the idea of turning all our theological language into the feminine gender arouses in most Christians, will ask "Why not? Since God is in fact not a biological being and has no sex, what can it matter whether we say He or She, Father or Mother, Son or Daughter?"

But Christians think that God Himself has taught us how to speak of Him. To say that it does not matter is to say either that all the masculine imagery is not inspired, is merely human in origin, or else that, though inspired, it is quite arbitrary and unessential. And this is surely intolerable: or, if tolerable, it is an argument not in favour of Christian priestesses but against Christianity. It is also surely based on a shallow view of imagery. Without drawing upon religion, we know from our poetical experience that image and apprehension cleave closer together than common sense is here prepared to admit; that a child who has been taught to pray to a Mother in Heaven would have a religious life radically different from that of a Christian child. And as image and apprehension are in an organic unity, so, for a Christian, are human body and human soul.