The word supernatural is a word we use in reference to that which operates beyond normal physical capability as practiced on planet earth.
You said "the universe is part of nature." No, that's not it. If you had said, "that which is natural exists in the universe," you'd have been more accurate. The word universe includes everything by definition, according to my dictionary, so nature exists in the universe.
Ok, if you want to use the universe to mean everything that exists, then that is fine.
Then my question becomes, why does the supernatural have to follow natural laws? God exists
outside of the natural world, it makes no sense for him to have to follow natural laws such as the 3 laws of thermodynamics. He created them, for heavens sake!
Off topic, but nothing is said in Genesis one specifically about the universe. It addresses some things in the universe to the effect that whenever they were made, god did it.
This arises from our different understandings of the word unverse. I guess I should ask if you believe the natural world has been around forever? (which would contradict Gen 1:1)
If you say there no absolutes, I ask you, are you absolutely sure?