Explaining a complex yet knowable system (the universe) with a more complex system that is off-limits for scientific study (God, or whoever) is not science. You can speculate about it all you want - and that is not bad - but until there is a way to test it, it is just an idea, not even close to a hypothesis.
This applies to everything, including the currently “accepted” scientific theory that all matter and energy that exists today ultimately arose from nothing.