Science isn't the end all of answers. What if the Book of Mormon said "there are no Brontosauruses"? But you read in Science that the Brontosaurus was a real dinosaur. They make claims of how it looks, what it eats, and how it interacted with other dinosaurs. Then you go to the local museum and find out that they even have a skeleton. Case closed. Time to leave the LDS Church because they lied. What a fraud! Hey Bishop, here is my letter!
But then what happens? Ooops, a scientist comes out and admits they accidentally put the wrong head on the wrong body, and the animal known as the Brontosaurs never existed. Guess the Book of Mormon was right.
I don't know. I just think that science is ever-changing, and for all we know, one day it could change course again and find horses actually WERE here during the timeframe necessary. Then what?
No, Josh, that isn't what happened with Brontosaurus. They put a Camarasaurus skull on its skeleton, which was later corrected. Also, taxonomically, the name "Apatosaurus" had already been applied to the same animal, which is why it is now called Apatosaurus instead of Brontosaurus. A misplaced skull and a change in taxonomy do not prove that the animal never existed.
Your choice of example was very poor, both specifically and generally. There is no analogy to the Brontosaurus with the Book of Mormon, because sauropod fossils have in fact been found--as opposed to the Nephite artifacts that do not exist. And the scientific method assumes that discovery will be ongoing and that theories will adapt and change to fit a growing body of evidence. That is the reverse of the case with the Book of Mormon. The growing body of evidence makes it increasingly unlikely that a Nephite or Jaredite civilization as described in the Book of Mormon ever existed. The banal observation that scientific knowledge changes does not address the fact that it is changing in a way that makes the Book of Mormon narrative increasingly implausible.
We've had 182 years in which a grand total of nothing has been found to substantiate the historicity of the Book of Mormon. For how many years, and in how many different places, will people have to look and find nothing before you are willing to consider that nothing has been found because there is nothing to find?