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.
It sounds like you're saying you don't believe in a supernatural. Which, as far as I can tell, means that you don't believe in a supernatural God. I think that's a totally respectable belief system.
Supernatural is a term used to explain what the science still can not explain. Only closed minded people think science can explain everything and can not think outside the box.