That's merely your conclusion. Others (like me) understand God as a being that was not created. Being Created contradicts Divinity. It's like asking "Who killed Newton's wife" when Newton, in fact, had no wife.

I conclude that God is the origin of everything. this is something you can't prove or disprove with Science. Some might argue it's not worth thinking about, but it comes down to the individual whether they want to think about it or not.

In this case 'what' is God for you? The origin (God) could be the Bing-Bang as well (or any other theory currently around).

If God is a 'being', an entity, it can be more than one, and has to have it's own origin story.