When last I checked only particles could do that.......not universes.
You didn't mention the universe - but actually, it's the energy-time version of the uncertainty principle and the energy of the universe may well be zero. However, I digress.
The theist nonsense about people having to explain the existence of universe is both silly and hypocritical. A god that then creates a universe is no less mysterious and unexplained than just a universe by itself. Postulating a god just moves the basic unknown around a bit, it doesn't explain anything.
And yet we have two things that are supernatural. Appearance of everything out of nothing or the eternal.
Even if they were the only possibilities, why would you class either as "supernatural"? What do you even mean by it? For that matter, even if there was a god, surely it would be the most natural thing in existence?