Nothing, really, which is why it's not a scientific notion. On the other hand, if a natural process can be described which accounts for the allegedly created item, the question then becomes why, given that a natural explanation exists, would it be flat-out rejected in favor of a supernatural "explanation"? In other words, why reject that which is comprehensible, in favor of that which, by definition, is incomprehensible?
incomprehensible placemarker