After he did the little girl thing he said "Do you believe in Ghosts? I don't" obviously if he doesn't belive in ghosts, he couldn't really talk to them, so it's obviously an elaborate hoax. Most people understand that everything Criss Angel does is fake, but he puts on a bloody good show. I may not agree with his style, or like the overboard psychotic magic he does, but he gets an A+ in getting the audiance hyped. I am indifferent when it comes to Criss Angel, while I don't follow him religiously, I don't hate him either, when he's not in his TV Persona, he seems like a rather nice guy.
Derren Brown did a similar thing where he pretended to be one, just to show how it is done, but he said himself that it made him sick to perform, the way people reacted when he knew he was feeding them lies. Criss obviously has to hide the fact that all of his work is jsut tricks, because if you hammer that home to the audiance, the show stops being entertaining. I did notice however how he specifically made tat commenta t the end, that's hwy I remember it, where when it came to talk to the dead, he made comment that it was fake because as well as many believe that it is wrong to trick people into such things.