If I say that I don't believe in pink unicorns, people who do believe are not going to burn me at the stake for not believing. That is not the same for religious people.

It is up to the person saying god exists to prove god exists. What test can I do to prove god exists?

The physical universe is the universe. There are only 4 things in the universe: space, time, energy, and matter - that's it. Matter and energy do not influence and are not influenced by supernatural forces. There are no supernatural entities or forces acting on nature, because there is no proof of anything beyond or outside nature. There is no proof of a collection of "spirit particles" and "spirit forces" that interact with our regular atoms.