As I said before, if the argument for your pet god boils down to "[my god] has to exist, otherwise this argument doesn't work", you have a problem.
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.'