This is the clearest and cleanest distinction that can be made, whether a belief system can be put to the test.
This test you refer to---sounds like you've slipped the naturalist position in whole hog right there. Only empirical evidence can satisfy this test you're refering to, no?
Science is pretty much the assumption that natural laws don't change. There are lots of other ways of viewing the world, but that is what science is and does.