I don't think that will happen, but if it did, scientists would first investigate the experiment to see if it wasn't faked, and if it wasn't faked, they would revise some of their theories, as has been done many times before. We don't still believe diseases are caused by demons, do we?
If it turned out that the universe had been created only 6000 or so years ago, most of our knowledge of physics would still hold true, it would just become apparent that the universe had been created to give the appearance of an age of about 13.7 billion years.
This would probably not suddenly prove the Christian view of creationism, and it would probably not prove any other religion's account of creation that I know of. It would probably be a different creator, and any human knowledge of him/her/it would be altered beyond recognition by a 6000 long game of Telephone.
Evolution would continue to be largely true, because it happens today and has been observed both in the laboratory and in the wild. We would still know what the creator intended us to see in the fossil record, even though it would be wrong.
The Big Bang theory would become one of many examples of how the creator chose to deceive us in every way possible. There is great evidence that evolution has been occuring for billions of years, that the universe was created billions of years ago, et cetera. The creator that we would see if we could look into the past like that would be seen putting down all sorts of clues to cover up his own existence, burying fossils in a specific order, making layers in ice and mud, adding specific amounts of carbon 14 and other radioisotopes into rocks and fossils, and so on. Much of the science that we will have learned will be indicative of a god who doesn't want to leave evidence of anything similar to what happens in the Bible.
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