I am forming some thoughts here based on discussion with Riley Barton and Jeff Reichman. I stole this first paragraph from Jeff Reichman. Jeff describes the situation very well.
[BEGIN]
Science, Assumptions, and the YEC Double Standard
Young Earth Creationists often argue that radiometric dating cannot be trusted because it rests on “unprovable assumptions.” At first glance, this sounds like a serious critique, but the reality is that all of science rests on assumptions. The difference is that these assumptions are tested, confirmed, and relied upon every day in ways that even YECs accept without question.
Every airplane that takes off depends on the assumption that the laws of aerodynamics apply universally and consistently. Every bridge that stands depends on the assumption that material strength behaves predictably under stress. Every car, phone, and GPS device depends on the assumption that electromagnetic laws, atomic behavior, and relativity are stable and reliable. These assumptions cannot be proved in a final metaphysical sense, but they are confirmed through repeated observation and practical success. Without them, modern technology would collapse.
And yet, occasionally those assumptions appear to be violated: a bridge collapses, a plane crashes, a car malfunctions. But even in the face of these failures, no one concludes that the underlying assumptions of physics or engineering are invalid. We recognize that accidents happen due to design flaws, human error, or unforeseen variables, not because the laws of aerodynamics or material strength suddenly ceased to exist. YECs themselves continue to fly, cross bridges, and ride in cars without hesitation, despite these occasional breakdowns. The inconsistency is outstanding: they accept the reliability of scientific assumptions in every area of daily life, but reject them only when those same assumptions support radiometric dating and an ancient earth.
Radiometric dating makes the same kind of assumptions as engineering and medicine: that decay rates are constant, that isotopes behave in predictable ways, and that contamination can be detected and accounted for. These assumptions are no different in kind from those underlying the technologies YECs rely on every day. If they dismiss radiometric dating because of its assumptions, they must also dismiss the airplanes they fly in, the bridges they drive across, and the phones they use daily. Since they do not, their critique collapses under its own weight.
The real issue is not whether science uses assumptions, it always does. The issue is whether we apply those assumptions consistently. YECs accept them when they support everyday life but reject them when they challenge their interpretation of Genesis. That double standard reveals that the objection is not scientific but theological. Science rests on assumptions, but those assumptions are the bedrock of every technology we trust. If we reject them selectively, we undermine not just radiometric dating but the very foundations of modern life.
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A few days previously, on November 29th, I had mused the following.
Old earthers believe in
1) the doppler shift is real
2) the red shift is real
3) the universe is expanding
4) the laws of physics are constant over the life of the universe.
5) singularities exist and the universe may have been designed before the big bang (and maybe during?)
Young earthers believe all the above violates their definition of scripture and are wrong.
I wonder:
What does the evidence say?
Can we extrapolate truth from what we see, or is it all deception?
Today, on Dec 3, 2025, I am thinking the issue is EXTRAPOLATION. On a known set of data in current time where the data is bounded this subject is called INTERPOLATION. In other words, predicting a value y=f(x) where x is an independent but unmeasured value and we are looking to guess (or interpolate) a value for the dependent variable y.
If we are looking for values outside our observational purview, for example the distant past or the distant future this becomes EXTRAPOLATION. So what young earthers are saying is “we cannot validly extrapolate laws based on physics. But why not? Theology! That is the reason. They essentially say “theology trumps physics because we say it does.” This is not based on inductive logic. Science itself is based (at least in part) on inductive logic – making observations within the purview of humans. That has to do with epistemology, ie, our purview, which is an observable domain of knowledge.
Christianity is also based on our human purview, an observable domain of knowledge, because of eyewitness testimony provided by history. Please note history here is defined as records of events observed by humans. But ORIGINS is an extrapolation because no humans were present to observe the alleged events.
Science offers an extrapolation of origins known as the Big Bang based on the idea that we can assume physical constants are constant across all time. This is temporal invariance. This is an extrapolation of our purview which old-earthers accept.
Another such extrapolation is evolution. Young earthers reject both extrapolations.









