Knowing this first, that there shall come in the last days scoffers, walking after their own lusts...2 Peter 3:3
To explore the differences between these two types of science, consider Exhibit A: rock layers in the Grand Canyon.
In the present, a geologist can observe rock layers in the canyon and can employ operational science to determine, among other things, the type of rock in each layer and to analyze the minerals found at each depth.
However, an evolutionist reaches the conclusion that over millions of years, water slowly carved through the layers of sediment that had been gradually deposited.
A creationist determines that, as a result of a catastrophic flood, the layers of sediment formed rapidly and, before they could completely harden, water quickly cut the canyon.
---The evidence is the same, and the results of the observational science experiments can be repeated and confirmed. Yet the two scientists walk away with different interpretations of the past because they had different presuppositions about the rates of geological processes in the past." AIG