What the story makes you see is that if you believe in a mortal God, who can win and lose his power, your religion will be saturated with anxiety - and so with violence. In a sense, you could say that a mortal God needs to be killed, from the point of view of faith (as the Buddhists say: "If you meet the Buddha, kill him"). And if you see religious societies in which anxiety and violence predominate, you could do worse than ask what God it is that they believe in. The chances are that they secretly or unconsciously believe in a God who is just another inhabitant of the universe, only more powerful than anyone else. And if he is another inhabitant of the universe, then at the end of the day he just might be subject to change and chance like everything else. He needs protecting: churches are there to keep him safe.

I read the books and the plays as a sort of thought experiment: this is, after all, an alternative world, or set of worlds. What would the Church look like, what would it inevitably be, if it believed only in a God who could be rendered powerless and killed, and needed unceasing protection? It would be a desperate, repressive tyranny. For Pullman, the Church evidently looks like this most of the time; it isn't surprising that the only God in view is the Authority.