Here is a potentially controversial take: The only thing supernatural is God.
The only dichotomy between natural and supernatural in the Bible is the Creator-creature distinction. In other words, there is only God and everything he makes. And everything he makes is entirely natural, including things like angels. Just because we don't have a scientific understanding or explanation of how one thing works or what another thing is made of, that doesn't mean we never will. Our baryonic understanding of physics fails to account for 95 percent of the universe, which means that we have good reason to suspect there is a vast host of natural things we currently cannot directly observe, explore, understand, or explain. They are not supernatural, they're just non-baryonic.
Only God "exists beyond and outside nature"—necessarily, as its Creator.
Since our scientific understanding is in its infancy, it may be a long time before we have a unified theory that marries relativity and quantum mechanics in a way that will start to reveal that other 95 percent of the universe, and allow us to develop theories on the existence and nature of angels, for example.
By way of illustration, the television show His Dark Materials (HBO) had an interesting idea with its Dust. The setting of the story involves a multiverse, which primarily takes place in the universe of the protagonist, Lyra Belacqua, but also includes a character who lives in our universe, Mary Malone. In our universe, Malone was researching dark matter, which she called "Shadow particles" or "Shadows," a name given to the particle by her colleague, Oliver Payne (in references to Plato’s Allegory of the Cave). She communicated with Shadows through an interface with her scalar field detector, which confirmed for her that these particles are constituted by dark matter. In Belacqua’s universe, it is known religiously as "Dust" or scientifically as "Rusakov particles," named after their discoverer. (Prior to any knowledge about Dust, Boris Rusakov had discovered a field permeating the universe that enabled consciousness, which implied the existence of a related particle. Both were then named after him.)