This is important in today's world, hiding it sends a message FAR SCARIER than is the fact that he is a Muslim.
If he is, he needs to speak to specific Islamic practices, how he feels about them, and he needs to speak to the Christians and Jewish in this nation, stating publically whether or not he sees them as infidels.
I've read that he is unitarian, not muslim. If true, his name is immaterial; it just shows what his father was, which is not binding on him.
In his book he stated he was as a boy, but now claims Catholicism