Obama has shown that when he speaks the words he thinks Americans want to hear, he uses the teleprompter and does the bobble-head thing. When he speaks of Islam and his Muslim upbringing he doesn’t need a teleprompter and speaks with pride and confidence. That alone should be enough to convince the average American that he’s not one of us.
Is it irrefutible proof (at a legal standard)? No, but sometimes we simply need to look at the totality of a person’s being and determine who they are by what we see and know to be true.
But does it convince you that he's a Muslim?