Having citizenship is not the same thing as being a natural-born American.
True. There are also 'naturalized' citizens. If Obama is not a Natural Born Citizen then he would need to be 'naturalized' to be a citizen at all. Clearly he never naturalized. So if he is not a Natural Born Citizen he is not a citizen, and needs to be deported to his country of origin, Kenya. He must also relinquish his Senate seat.