I think, if you want to make a moral arguement for God, you'll be forced to find something transfiguring in suffering. For that I recommend Soren Kierkegaard's book "Fear And Trembling"; in defense of the story of Abraham.
I'm not content to dismiss the idea of God because I wouldn't endorse his actions myself, I want to understand the best arguements for such an authority to refute them, from a fundamentalist point of view even. If you want a really damned book: Soren Kierkegaard's "Either;or" was something I couldn't sit still for a long time after having read it.
It helped me to understand an uncompromising faith experiencing it myself. It isn't all hurrendous, some of it is useful.
"If complete indifference is required for freedom, then there is scarcely ever a free act. For even if by chance, the reasons are equal, the passions will not be"-Leibniz