You can't win an argument by explaining away every thing as a miracle. Its a cop out.
Who's trying to win an argument? I'm just noting that either God exists or He doesn't. Millions of us believe that He does exist and does perform miracles. If you don't believe it, fine. You just have a different belief system than we do. I believe light exists and behaves as it does because God created it and designed it to work a particular way. You believe light just happens to exist and just happens to behave as it does.
Countering a "God created light to behave as it does" argument with a "Light just happens to behave as it does" argument isn't a winner, either.