"All else being equal, whatever model is most compatible with the data, wins."
But that is an epistemological judgement. You could have a model that is very compatible with the data that is nonetheless false. If you are willing to create enough epicycles, you could (with a great amount of effort, no doubt) return to the Ptolemaic model and create a 'compatible model.' Here we might turn to Occam's Razor. Yet, pure parsimony doesn't necessitate truth, either. I know you said 'all else being equal,' but that leaves out quite a few things that ought be considered and some would argue 'wins out.' Ie, some might say, "all else being equal, whatever model is simpler, wins." I have heard it.
These are epistemological questions that exist completely apart from the data itself.
"Yes, if you assume the geological column was created "de novo", no time was involved. "
That is not the creationist position, though, is it?
I wonder, do people on this forum know the difference between creationists and theistic evolutionists?
"If God created the universe so it appeared to have many billions of years of history, then it could have been created quite recently. But, why would God deceive us as to the age of the universe?"
On the other hand, given a trillion years worth of time, it is certainly possible too that this current manifestation only appears to be old, as well, and is in fact only a fleeting second. We can go further: It is possible that there was a BANG only a second ago and we were produced, replete with all the memories we have and the 'knowledge' we have, but they are nothing more than the manifestation of a certain pattern of electrons. Pure reductionism and unlimited amount of time to play with allows such things. How do we know that we are not in such a situation? Harry said on my "Harry's Huckleberry" thread that given enough time, anything thats possible will happen. The above is possible- it will happen. How do we know it hasn't happened and we are in fact in it?
These sorts of questions are not at all limited to theism. Nor does it follow that simply because God might decide to create a man from scratch, with apparent age, mean that he was trying to deceive anyone. What did you want him to do? Create the embryo without a womb and nurse it in the open air for 9 months and raise the first man through infancy and childhood until he reached the years of critical thinking so that the first man wouldn't feel deceived?
He can create the stars, but not the light in transit, so that future skeptics who don't even believe in him anyway won't feel deceived when they think that they can measure time and/or distance from that light? You'd put your faith in a God who can create a star but not light? An embryo, but not a man?
Naturally, as a point of philosophy, creating things 'of age' is a possibility that isn't exactly easy to test. To some degree, most creation accounts will admit to the creating of something with apparent age- otherwise its not really a creation at all. But that doesn't mean that this amounts to deception. It could reduce to nonsensical expectations, too. There are other ways of looking at the same matter that doesn't presume deceit.
"A very good question, with the proper skepticism concerning human motives. However, we have agreement between measurements using entirely different scientific concepts. For example, ... The age of the Earth can be determined by the nuclear decay rate in certain crystals. Billions of years."
This will be a fair point to raise when I finally post on my YEC thread. Corroboration is certainly an area of common agreement in regards to what might constitute a robust epistemology, but your examples leave aside the possibility that even your dating with crystals and the age of the white dwarf stars are derived only after you've accepted the assumptions underpinning the model you've already accepted.
"Certainly, you can just say: "God willed it so". That will explain any data, but it kills all inquiry."
Or you could say, "It just evolved" and that will explain any data, too. Given a certain amount of imagination, you can create scenarios that can bring anything about. See the dismal movie "Final Destination" for a grand example. Or, as Harry would say in trying to escape the implications of the apparently observed "anthropic principle," given enough time, anything that is possible will eventually happen, no matter how unlikely.
Just because you have 'explained' something doesn't mean you've given an accurate account of it, either.
Its not a matter of killing inquiry to arrive at a point where one ought to say "We're at our wits end- there is no other REASONABLE explanation for this." That's not killing inquiry. That's being honest.
How do you test for whether or not it is in fact A FACT that a billion years ago one cell was swallowed by another creating the Eukaryota domain? You might devise a test to show its plausibility, but we are talking about an event in history. How do you go back into time and re-create past events?
There are some questions that one cannot 'test' that do not therefore 'kill inquiry.'
"I agree that is what happens, but the creationist models are not science. They will not lead to new medical advances."
Are you sure about that?
Also, what makes any model scientific? No model is 'science.' Models are models.
"They will not aid us in countering new diseases. They will not predict what new organisms are likely to evolve."
Oooooooh. Well, I've been dying to hear an evolutionist tell me what the next step in human evolution is going to be. Care to share the next ten steps?

As for the tenor of your comments, you do not understand creationism as distinguished from evolution(ism?) if you don't think that it covers the same data around medicine and virii.
"Apparently, everything there is to learn about God was learned no less than 2000 years ago. Do you really believe that?"
Not only do I not believe that but I don't think that biblical literalism calls for it, nor have I met many people that could really be called 'biblical literalists' in the way I think you mean.
While I'm on that subject, I take the parts of the bible and interpret them in the literary genre they happen to be. Genesis 1-11 are NOT in the genre of metaphor. I don't think Jonah is, either, but its a little more ambiguous. For a non-believer, I'm willing to let it slide. Some of the Psalms, as songs, are clearly symbolic. The book of Revelation is symbolic. That isn't to say that there aren't literal truths beneath them.
"That is a fundamental difference with science, which KNOWS it is imperfect and constantly tries to improve. Good science is driven by curiosity."
I'm a big fan of science. At least, I'm a big fan of experimentalism. The fundamental difference in THESE debates is when things that are actually in the realm of philosophy, epistemology, model-evaluation, etc, are given the mantle of science and skeptics are buggered off. And my personal favorite- when theological doctrines themselves are ransacked by skeptics and re-presented in scientific lingo and suddenly treated as credible.
For example, the idea that 'anything that is possible will eventually happen given enough time' is a very close cousin to the doctrine of omnipotence. Attribute it to God, and its theology. Attribute it to the universe, and its science. ITS THE SAME DARN THING. Almost. :)