Gravity and Evolution

A reader writes:

While I'm with you on the rejection-of-evolution-is-a-rejection-of-reason, the guy you quoted doesn't know what he talking about. In any high school science textbook, evolution is indeed a theory, and gravity is indeed a law. 

Look up the difference of the scientific definitions of "law" and "theory."  Gravity is one, and evolution is the other.  That said, if it was thus far possible to prove evolution false, it would not be regarded even as a theory.  But it does not have the same status as gravity as a scientific principle.