From the first word on, I absolutely adored Campbell's and Vogler's works about the hero's journey, knowing, of course, that "hero" could also stand for heroine. And surely, we collected quite a few stories with female lead characters. But we hardly ever come across a wise old woman. From Merlin to Gandalf, or Obi-Wan, or Dumbledore, we have met and learned from so many wise old men having sacrificed themselves to allow their heroes to fulfil their tasks that we just could not imagine a woman in this role. And since the hero's forthcoming solely rests on the wise old man's act, we just know that he will be there, a human deus ex machina.
And here it is, the source of nearly all our problems. We live expecting that our expectations will be fulfilled. If not, we feel empty and betrayed. But if we thought it through, we would know, what is wrong, what has been a lie throughout the history of mankind. There are no wise old men. There never have been, and there never will be. The truth is, most men never even grow up. They become big boys.
Can you see the dilemma? That is why we imagine G'd as a man. We just want to hope for the wise old man. We even killed the few wise old women who were nothing but a threat to our belief. Shame on us.