Rule concept: "About God in stories..."
"God" is not anyone's character. He is free for anyone to use, but there cannot be any major or permanent changes to Him. You can't kill Him or hurt Him, He does not obey the laws of powerscaling, and doesn't have any real limits. He can be used for plot purposes, but He does not take any specific sides nor can He directly intervene in a story unless the decision will ONLY affect characters/locations owned by the writer of the story it takes place in, or if the owners of characters and places used all agree upon the change.
Basically: No using God in stories in a way that could mess with other people's stories.