The effects of dark matter on visible matter can be observed and measured. The moment anything even remotely similar for a god is postulated is the moment the two things can be mentioned in the same discussion with any degree of rationality. Until then it's simply sleight of hand.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'