Exactly how much science would be wrong if evolutionary theory were incorrect?

That's exactly why it is a THEORY. Theory's, in science related topics, are ideas that have not been fully proven, which is why it isn't the evolution law. If this evolution theory is proven wrong or proven right, then I suppose it would either become just a belief or a law of science. It is my understanding that this theory has been tossed around for centuries, and I'm reasoning that centuries of data would be null and void, false, and essentially just a waste of time. As to how much of all this data would be false, that is not necessarily an answerable question, as there is so much information and data that has been collected over these past centuries that wouldn't just disappear. I suppose if this theory is ever proven unrealistic, then this data will be still around, however just not in science books. This information will always be considered possible, in my opinion, because there is no way to prove it wrong or right. Simply said, it's a theory, a fact that is yet to proven, as to how we have come to be, and it isn't proven. In my opinion, no one will ever truly be able to "testify" against this theory, being that hundreds of hundreds of years of data has been collected, and to prove it wrong would truly be miraculous.