The physical world that we can see is evidence of its past. A fossil skull, for example, is proof that something happened at an earlier time. What we think it's evidence of is based on our point of view.
Evidence is Irrelevant
The Decay Constant isn’t Constant
The decay constant is a fictional contrivance necessary for the popular science (SciPop) rationalization of the geological timescale and the age of the Earth. It's critical to the SciPop claim that there's no hell.