Whether you personally think what the Indiana court did is right or not, they didn't just make it up. There's a pretty straight forward path to arrive at the conclusion they did. I strongly suspect no other court will arrive at a different conclusion.
“Naturalized citizens” didn’t exist at the time the Constitution was framed. There were only Citizens, and Natural Born Citizen for President. A new term thought necessary by the framers, but not by you as you wrongly consider it to mean the same thing. See http://naturalborncitizen.wordpress.com/2009/11/13/indian-court-of-appeals-trips-over-natural-born-citizen-issue/