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Interestingly enough, that is the way that many fundamentalists (of various religions) seem to think that science should run. You start with the stated fact that the world is 6000 years old and then you work backwards using mental gymnastics to try to find a way to get the carbon-14 dating, radiometric dating, the doppler shift and the like to fit your facts.
I've always maintained that the fundamentalists would have a much better logical argument by simply chucking the science altogether. Instead of coming up with silly theories like the boiling water of the flood made the earth appear billions of years old, they should just say "God did it" and leave it at that. Of course it sounds silly and it opens up a bunch of other questions, but at least then they don't have to fight the scientists.