The existence of matter hardly proves anything, other than it seems reasonable to assume it's there. But what is reality? What is real? That question was hard enough in Socrates' time, but today quantum physics has really complicated that very basic question.
What proof do you have that this god, this "creator" being you speak of exists and is necessary for the order of the universe. A universe, of which, by the way, not a single one of us has any sort of understanding or vast amounts of knowledge of. It's quite a leap of faith on your part to promote yourself to such an authoritative position, when no one, not even those who study the universe, really knows what the universe is. We don't even know how big it is, and you are making this claim you know god is necessary? On what grounds is this god necessary?