Wouldn’t it be ironic if fellow Muslims from his native country put out a fatwa on him?
Obama may or may not have ever formally become Muslim.
But consider this. Under Muslim theology, someone such as Obama would be considered an apostate Muslim. An apostate is someone who has rejected Islam. We know he was at least educated and exposed to Islam through his step-father.
Under Muslim theology, an apostate Muslim is considered lower than an infidel who was never Muslim. An apostate has rejected the faith, whereas the infidels who have not ever been affiliated with Islam in the first place have not committed the “crime” of having rejected Allah and Mohammed and Islam.