Dear Mark:

God did not reveal Himself in the feminine. God revealed Himself as Father, Son, and Holy Spirit.

How dare we refer to God differently than how He revealed Himself to us. It is patent arrogance as well as a blasphemy to refer to God as "her".

In addition, there are theological reasons for the masculine reference. For example, the male is the progenitor. God the Father is the creator/progenitor of all the universe.

To refer to God as she, when God Himself does not do so and when theology demands otherwise is to form a kind of idolatry -- to make God in our image, to bring Him down to our understanding and preferences. This we cannot do and dare not do. We simply do not have the authority or the right to refer to God differently than He refers to Himself and it is arrogance of the worst kind to try.

Whatever this movement is to call God "she", it is not Christianity. C.S. Lewis, in an essay on women’s ordination in Anglicanism, put the matter thus:

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 favor of Christian priestesses but against Christianity.

Cardinal Ratzinger made a similar point in The Ratzinger Report:

Christianity is not a philosophical speculation; it is not a construction of our mind. Christianity is not ‘our’ work; it is a Revelation; it is a message that has been consigned to us, and we have no right to reconstruct it as we like or choose. Consequently, we are not authorized to change the Our Father into an Our Mother: the symbolism employed by Jesus is irreversible; it is based on the same Man-God relationship he came to reveal to us.

For more detailed discussion of this issue see the following two articles:

Why God is Father and Not Mother by Mark Brumley

God Has No Daughters: Masculine Imagery in the Liturgy by Leon J. Podles

God Bless,
Bro. Ignatius Mary