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.
The Decay Constant isn’t Constant
Weaving the Cultural Fabric of Our Time
Consider this our way of telling the world that we're beginning an evangelistic mission, preaching salvation through faith in Jesus Christ. On the internet, for free.