"Sntjohnny has some unusual requirements for what counts as scientific validation in that he appears to believe that scientific theories can only be validated in controlled laboratory experiments."
This isn't exactly accurate. It has always been my primary point that there is an epistemological difference between 'theories' that are validated via direct experimentation and observation in controlled and/or repeatable situations and inferences from data that are not derived in that fashion. Call it 'science' or whatever you like, but don't gloss over or lie about the different epistemological basis that undergird whatever it is you have decided to label 'science.'
The secondary point is that what you call 'unusual requirements' are exactly what students learn in elementary school and high school. Thus, when told that evolution is 'science' they think of what they were taught science was, and assume that evolution must have been verified in the same way. Since not even those who go onto college get to take a battery of science courses to see what else gets thrown into the mix about what 'scientists' say about 'science,' most folks are left with a very misleading view of the issue.
Which brings up an important third point- why are the evolutionists dishonest? Why is it so important that their view be labeled 'science'? Or, if we granted that it can legitimately have that label, why are they afraid to point out the epistemological differences between certain theories... say gravity (the example of choice lately) and evolution?
These are legitimate concerns, and frankly, any scientist that is not even willing to concede that there is an epistemological difference is useless and should have his funding withdrawn. Not because I want to suppress his point of view, but because he's an idiot.
Thanks, btw, for admitting that evolution cannot "be validated in controlled laboratory experiments." That'll help.
Copernicus:
"So it is really the predictive power of evolution theory that confirms it as scientifically valid."
Also Copernicus:
"Let's not forget that evolution depends on the serendipity of changes in the environment and random mutation."Its not the 'predictive' power of evolution, its its 'explanatory' power. As has often been said but completely ignored by thou, any part of evolution that is truly predictive fits within the creation model, as well. All the controversial claims are not predictive at all. And in terms of the 'explanatory' power, well, anything can be 'explained' if you are allowed to invoke the veil of a billion years and chance events. oops. I'm sorry... I don't want to mischaracterize you... I'll rephrase: allowed to invoke "serendipity of changes in the environment and random mutation."
"Creationism, unfortunately, makes no predictions that we can verify through natural observation,"
Well, not true. But this is just the ignorance talking, so we'll let it slide. Did you forget to login as Cogito?

"although one might expect that the fossil record would look differently than it does. (For example, there is no fossil record of a global flood.)"
More ignorance. You have no basis for saying that it would look differently. Have you performed or are you aware of any tests that have been made to determine proper expectations on the point? Feel free to cite this material if you've got it. Otherwise, what has been pointed out fairly frequently is that hydraulic sorting will be a significant player, and in case you are not familiar with the concept, try taking a walk along the seashore sometime. Thus, the stratification of the fossils into layers, which the evolutionists take as being a record of evolutionary progression is perfectly consistent with creationist expectations.
Oh, but there is just one teeny-weeny difference: hydraulic sorting can be done in the lab, in a controlled environment, and repeated over and over again. Thus, we can actually derive some realistic expectations about what to expect in a catastrophic flood, and furthermore could make predictions from observed geological formations to what would happen in a similar scenario.
Seriously, Cop. I understand that I have a certain obligation to present my argument, but you have an obligation to show that you've done a little legwork. Checking out Talk Origins is not legwork. That's strawman building. There are a number of creationist sites out there. Try educating yourself. I beg you.
"Minimally, a scientific hypothesis must be a proposition that can be tested through naturalistic means."
Begs the question.
"Evolution theory has been verified through methodological naturalism. It is not, as sntjohnny gratuitously claims, philosophical naturalism in disguise."
Well, for the sake of argument let's allow that this is the case. However, if we open up our high school text books, I'd wager that there is no caveat that says "through naturalistic means." There is no caveat that says, "This theory was derived by assuming for the sake of operations that no supernatural interactions occurred."
Mine didn't, at least. But let's assume it, and let's even assume its a perfectly reasonable position. If so, however, it certainly deserves mention and examination and discussion. So, taking this assumption as the one in play, let's restate the scenario:
"Actively precluding even the possibility of looking at the evidence and inferring that the best explanation will be non-natural, the following theory, "X" was derived."
Ok, but then the rational implication is:
"Given the above methodology, it follows that "X" may not actually be the best explanation of the data. Nor can it be treated as argumentation against non-natural explanations, for as was just established, non-natural explanations are not even allowed on the table."
This is something that should be stated in the science classroom. Naturally, it may incite the question, "But how does the data fare if we are allowed to put more possible interpretations on the table?" To which, the science teacher may have to say, "I'm sorry, but we are not allowed to do that."
Thus, honesty has prevailed. Students will understand that the question of life and its origins has been examined by precluding any non-natural explanations. Ie, explanation by fiat. And yet, no one could then turn around and show that life and its origins have been really proven to have been 'explained' by natural mechanisms in any non-trivial fashion. How could it? How can you ever say that 'natural mechanisms' are the best explanation for something when 'non-natural mechanisms' were excluded from the start?
It does not matter that you think the 'non-natural mechanisms' are spurious, by choosing not to even consider them as potential explanations you are unable to say whether the evidence supports one or the other, better.
But I am still not going to agree that even methodological naturalism precludes explanations that include agency. Perhaps you don't either- but I make no distinction as to whether that agent is 'natural' or 'non-natural.' Agents leave their mark, and science is permitted and able to detect them. Choosing not to allow for the possibility of agency if the evidence suggests it may be 'science,' but it is not nearly in the same category as other areas of scientific inquiry.
And as a final note, I say all of these things taking for argument's sake that what is being proposed be evaluted is primarily 'supernatural interactions.' We've made it quite clear that its the catastrophic elements of 'creationism' that we think ought to be mentioned, and by your argument "For example, there is no fossil record of a global flood" you admit that the proposition is as scientifically (by your definition, even) testable as other scientific explanations that have been offered.
Thus, the obvious question is whether or not you have any empirical basis for that claim. If you do, than you have shown that there is something to 'creationism' that can be evaluated in the science classroom, after all, and as such, the science teacher could proceed to knock it down. I say that knowing that geologists for the last 2 centuries have not made their decision to reject the flood on experimentation, but rather on the adoption of a new assumption: gradualism, uniformitism, etc.
It seems to me that this assumption and any other that sits underneath any scientific theory is worthy of discussion in a science classroom. And if scientists or science teachers should like to hide those assumptions or call their assumptions facts, or treat an inference with the same epistemological courtesy that they do of, say, a measurement of the speed of sound, than they need to be held accountable. Checks and balances, baby. If they're hiding something, they're hiding something.