Halcon: was it mere coincidence that instead of anything else as an explanation, time and time again it had to be God?
I don't know if god was always the explanation for the unknown. It may have been the most convenient explanation because it wasn't falsifiable. If there was a single being responsible, one would expect that every explanation would refer to this specific being. But, over the course of human history, entire pantheons were invented and catalogued and used to explain the unknown.
Once we developed a more reliable method for discovery and learning, we began to find testable explanations for the mysteries of nature and the universe. To date, we have not stumbled upon god as one of them. I think this is not a coincidence.