Actually, it's way funnier than that, because most religions are strongly in favour of moral relativism and subjectivism. When the standard for what is moral is the opinion of some guy, that is clearly just a subjective opinion, and when different cultures refer to different guys for the opinion, that is clearly relative. Just adding the further nonsense claim that your guy also created the universe, or something to that effect, seems to be an effective rhetorical device, but doesn't change that it's just a guy's opinion, not an objective fact.