As long as "God" remains in the realm of the supernatural, ie, the unobservable, there will never be scientific proof that he/she/it exists by definition. Science, by definition, is about building and testing hypothesis based on repeatable, observable experimentation. Anyone who expects to find scientific proof for "God" either has a non-traditional view of "God" (ie God is not supernatural) or else has a mistaken view of science.
Yet there are many things that are common now, that 200 years ago would have been CALLED supernatural.
I would say that regarding things in this universe, nothing is supernatural. Some things only appear that way, and will until we find the technology to control them.
