Assuming that he ever became an Indonesian citizen, and Indonesian law seems to make that impossible, still under U.S. law you can only give up your citizenship if you are an adult. Nobody can do it for you.
He had to to attend the muslim school. You must be an Indonesian citizen to go to school there. He was adopted by his Indonesian muslim stepfather Mr. Sotero. Indonesia did not allow dual citizenship. He went back to Hawaii to live with his communist grandparents. As an Indonesian. What after that I would like to know. He is obviously perpetrating the biggest fraud in American history.