Even if a god, let alone 'God', was to appear to me right now, I would hope it would be extremely disappointed in humanity were I to fall to my knees and accept it as a god merely on the strength of the experience.
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.'