Why do people believe in a supreme being? This question has nothing to do with some sort of ontological connection (or causal connection, as you seem to believe) between majority opinion and existence. Rather it has to do with explaining BELIEF. Indeed, WHY do most human beings believe in an ultimate foundation for existence? I challenge you to answer that question. I do believe it is a legitimate one. If you do not think so, please defend that position. (I think it would be very difficult to explain why this question is illigitimate, especially since Marx and Freud addressed it. They must have thought it important enough to answer it in a detailed way) I'm willing to wager that most "thoughtful" people, such as yourself, would agree, once you understand what the question actually is. So, it would seem that you have misunderstood the argument. It is called the argument from the best explanation. (most beginning philosophy classes discuss this mode of argumentation)