So, what if his BC says Muslim on it when he was born. Just because your parents are, doesn't mean he is. And with him living abroad as a child, and going to Muslim schools, doesn't make him a Muslim. Just gives him a bigger picture of how the world looks. Instead of a narrow minded view.
Just because my parents are Christian, doesn't make me one!!!
Go to politicalfact.org, they have pictures and proof of citizenship, and pics of the paper that shows the birth announcement.