Good Omens(TV) And The Ineffable Plan

Behold, everyone: the deep dive into Good Omens theology that nobody wanted!
 
I was driven to write this. I don’t know why. Possibly because one of the first novels I ever tried to write was about a pair of (female) angels who were best friends in heaven until one of them joined the rebel angels and fell. Anyway, of course the A/C relationship is the heart of the story; but I got interested in the theological contexts that the Good Omens miniseries creates/uncreates/deconstructs/reconstructs around it, so here we go.
 
Please be advised this whole post is based on the TV series. Nearly everything I'm talking about here was either augmented or invented for the TV adaptation. I’m particularly interested in the decision to cast Frances McDormand as the voice of God. Because that highlights an interesting question often asked by queer people who were raised in some version of Christianity: Is God an asshole? Or, to elaborate: Is God as much of an asshole as the Christian church I was raised in makes God out to be?