What "observed reality" are your referring to? Perhaps you mean the "billions" of years which no one has seen or measured? (I'm sure we'll get to the folly of "carbon-dating" at some point.)

Or the light-years between stars that *must* mean the light has been traveling for billions of years? Could not a Creator have simply created these things into existence, including the light perceived as already being in transit? Certainly could have.
Make no mistake, I do not disagree with the concept of a light-year or the laws governing mathematics - indeed mathematics as been called a language, and a beautiful one at that! It's the application of the knowledge we gain that sometimes takes us down the wrong paths. Even science itself acknowledges that many mistakes are made along the way before something is proven. Science is constantly re-writing itself to improvement.