I've not read it, but isn't Pullman saying Jesus was one person and Christ another? Brothers? My piece based on a theory that Michael the Archangel was God's son, later known as Jesus Christ, the Deliverer. So just a single being. Also, the belief that God is both good and evil.
This was written some years ago and not well received when i posted on another site. I decided to rewrite and update it and see what people's thoughts were now.
Thank you for your thoughts and input, Marty! Much appreciated.