Um, he doesn't show what Religion he is in because he would get more booes from everyone else causing him to lose upporters. Just like how he and other presidents change their accents to 'become at home' with the locals. Like Northern vs. Southern accents.
Well, we aren't supposed to judge. Only God knows the heart (Book of Samuel), despite W.'s constant remarks that he knew someone's heart. From observation, I think Obama is probably a "Casual Christian". He doesn't go to church every Sunday -- many Christians don't. Still, he does believe.
Only God knows, for sure. Judging by his actions, I would say no. He's not. Remember that speech he gave, where the crowd booed God? I didn't hear him object to that. There are many other actions that tell me he is not a christian. There was also another speech, where he mocked God and the Bible. Actions speak louder than words.
Probably not he seems like an athiest.
I still think he's Muslum.