Parts I and II mentioned young carbon 14 dates as evidence that very old isotopic dates correspond to true ages in the thousands of years. Also, helium retention in zircons and the pattern of discordances in isotopic dates suggest an increase of decay rates in the past. There is also evidence that human mutation rates were faster in the past, which is consistent with a higher level of radiation. Furthermore, the genetic diversity of humans and other organisms suggests an origin a few thousand years ago. Several references by Anderson and Spangler suggest that decay rates can vary.
Part I mentioned helium retention in zircons and young carbon 14 dates as evidences for a recent creation and for an acceleration of decay rates in the past. Such an increase in decay rates should have more of an effect on ages computed from isotopes with long half-lives than elements with short half-lives.
If you add millions of years to the Bible, this is what you get.
I once heard a radio show host ask a caller, if it could be proven beyond the shadow of a doubt that the Bible wasn't true and that Jesus wasn't who he claimed he was, if the caller would be willing to accept that information. I remember thinking that I would like to ask the host the same question, turned around, if it could be proven, beyond the shadow of a doubt, that Jesus really was who he claimed to be, would you accept that? Are we willing to believe the evidence? Or do we resist truth or new ideas because of preconceived notions, traditions, or dogma? I see no problem with evidence and the truth. It certainly beats lies.
One scientific challenge young earth creationists have had to address is the starlight-time question.
From NASA: Binary spiral galaxies NGC 2207 (left) and IC 2163 (right) are estimated to be 114 million light years away from Earth