So are gravity and electromagnetic theory. That's because, although there's endless evidence to show that our observations and calculations of gravity and electricity are correct, it may be, for instance, that Jesus's tears come down from heaven and invisibly insert themselves in the gravitational/electrical process. Because we can't rule out every possible alternative then gravity and electricity have to remain theories, like evolution.

Lyle, you could spend your entire life studying stuff we already discovered about evolution and still only scratch the surface of our current knowledge. The evidence is vast and overwhelming. Only in parts of America is it even questioned.