The strongest argument for a god is that the idea that the material universe would come into existence without an external cause violates every known law of said universe. The problem for most theists is that it’s a long way from this argument to belief in a specific revealed creed.
I’ve never found this notably more convincing than any of the others. By the same logic, God ought to have had a creator, and his creator a creator, and that creator a creator, and so on and so on forever. If you’re going to refuse to accept this infinite regression, why can only God be the prime mover, and not, say, the Big Bang?
Only something confined by the realm of time, as our Universe appears to be, would logically require a creator. Any hypothetical creator would have created time itself and therefore the concept of a beginning and would not need a first cause. That in and of itself isn’t an argument for God existing, but the “Well, who created God?” line of thinking doesn’t really make sense when we think of “God” as the creator of the Universe…
