Robert/Greg, good morning. I am feeling your pain. I too am a six-day creationist who opposes biological evolution. But with a strict YEC label, you will never be able to gain any traction in these kinds of skirmishes. Our paradigm must change first. Let me explain.
The RATE group concluded “billions of years’ worth of radioisotopic decay in the planet material” yet they failed to tell us how to achieve that kind of deep-time activity and still hold to a young Earth. They say they are still working on that solution. I have seen some of their solutions and personally am not satisfied.
In the meantime, armed with only a young Earth, you go out here to argue with those who already know that the YEC RATE group has basically admitted to an old Earth by concluding billions of years worth of decay rates. Do you see your problem? You have gone out to fight a battle you have not been properly equipped for.
One of two things needs to happen before YEC’s can argue and have any chance of holding their ground. 1. The RATE group needs to ‘regroup’ and find a young-Earth explanation for all those billions of years of radioactive decay, or 2. We need to change our paradigm and admit to an old planet.
There are ways to admit an old Earth while still holding to a recent creation of life and still opposing biological evolution. Yes, I know that to YEC’ers that kind of language sounds heretical, but then, like I said, Something needs to change. Our current paradigm is no longer sufficient to explain the evidence.
Good luck. At this point, that is about all I can wish you. Stay true to your beliefs, but be flexible enough to admit the contradictions in your ideology when they arise – and do something about it. Complain to the big YEC conglomerates. Tell them they have not given you proper ammo or equipment to fight your battles.