A Muslim Father imparts Islam to his children according to Islamic Law. Therefore, whether practicing or not, Obama started out as a Muslim, according to Muslims.
Did he ever renounce his Muslim faith?
If so, when and where and to whom?
If he did, is he subject to the death penalty as an apostate?
He has a name bestowed upon him with the H-S-N triad, which is given to a child who is considered Muslim.
His middle name was an indicator that his father considered him a Muslim.