The only way Obama could renounce his citizenship in the eyes of the US would be if he did so himself, which means it would have to be when he was of the age of consent. Indonesia doesn't have the power to take US citizenship away from an American. Would Indonesia require proof from the US embassy that he formally renounced US citizenship before granting Indonesian citizenship, or would they simply not recognize his US citizenship once they made him an Indonesian citizen? If it's the former then to make an issue of it somneone will have to find the formal renouncement of citizenship down at the State Dept. If it's the latter, under US law he would still be American. IMHO