"This textbook contains material on God. God is a theory, not a fact, regarding the origin of the Universe. This material should be approached with an open mind, studied carefully, and critically considered."
I also note that creation by supernatural forces by one or more gods is the only explanation for the origin of the universe. One could suppose the universe has simply always been here, but modern astronomy now suggests it all just sprang into existence in some kind of big bang...a miraculous event, which obviously supports the one pre-existing hypothesis: divine creation.
So since it is the only explanation, why not discuss it. Maybe someone will come up with a new one.