The Bible clearly teaches that we live in a relatively “young” earth. Based upon what is taught in the Bible, the earth can not possibly be more than 6,000 to 8,000 years old. It is absolutely impossible to harmonize what the Bible teaches concerning the age of the earth with the claims of modern evolutionists. They would have us to believe that the earth is billions of years old.
In defense of the “old earth” model, some would offer the “proof” of various “scientific” dating methods. Some of the better known dating methods are Uranium/Lead; Potassium/Argon; and Carbon 14. Each of these methods attempts to establish the age of things by measuring the levels of decaying radioactive isotopes present in the substance and comparing this to assumed original levels. These tests often yield apparent ages in the range of millions of years. Can these methods – also known as radiometric “clocks” – be trusted?
In order to have a reliable “clock” some things are necessary, such as:
1) The clock must be set correctly at the beginning of the test period.
2) The clock must not be disturbed or reset during the test period.
3) The clock must run at a known, constant rate.
As an example, compare these necessary things to the Uranium/Lead “clock.” Uranium (U-238) is constantly converted to Lead (Pb-206). By measuring the relative amounts of Uranium and Lead in a sample, scientists claim the ability to “date” a given sample. But: 1) We do not know the setting of the “clock” at the beginning of the test. It is assumed that there was no lead in the sample initially. This simply cannot be proved. 2) It is assumed that no external sources contaminated the sample during the test period. In reality there may have been many natural factors that either added to or took from the levels of Uranium and Lead in the test sample – thus resetting the “clock.” 3) It is further assumed that the decay rate of Uranium into Lead has always been the same. This may be true, but it cannot be proved. Knowledgeable scientists admit that possibility that such rates may have varied over time making it impossible to know that the “clock” rate was always constant.
The various methods of radioactive dating simply cannot be trusted to be reliable over the time periods they presume to test.
– by Greg Gwin