Because of his high position Obama can avoid beheading for leavng his Islam religion, but there is always a chance that he may return.
With few exceptions, the jurists of all Sunni and Shiite schools prescribe execution for all adults who leave the faith not under duress; the recommended punishment is beheading at the hands of a cleric, although in recent years there have been both stonings and hangings. (Some may point to cases in which lesser punishments were ordered — as with some Egyptian intellectuals who have been punished for writings that were construed as apostasy — but those were really instances of supposed heresy, not explicitly declared apostasy as in Senator Obama’s case.)