Some of the events described in the Bible might be verifiably supernatural if they occurred under specific conditions. Walking on water, converting water to wine, parting the waters of a sea, resurrecting a dead person, giving a man who had been blind from birth sight, and so on: under most circumstances it's impossible to say for sure that something supernatural or miraculous happened, but under controlled conditions it would be possible to rule out nearly every natural explanation. But this has never happened. And to date, every unknown that we have managed to understand had a natural explanation, not a supernatural one. All you might need is one example. We have zero.
"Well, evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts. Facts don't go away when scientists debate rival theories to explain them. Einstein's theory of gravitation replaced Newton's in this century, but apples didn't suspend themselves in midair, pending the outcome. And humans evolved from ape- like ancestors whether they did so by Darwin's proposed mechanism or by some other yet to be discovered."
-Stephen Jay Gould
-Stephen Jay Gould