So I was thinking about this the other day. And you know, if Obama is a Muslim, he is an incredibly backslidden one.
You see, to be a true Muslim one has to follow the "Five Pillars of Islam-" Iman (faith), Salah (prayer), Zakah (tithing), Sawm (fasting), and Hajj (pilgrimage).
So I haven't seen Obama doing ritualized fasting like Ramadan, because I'm sure we'd have seen something about how he doesn't eat until the sun goes down. One pillar down. Nor, to my knowledge, has he made a Hajj to Mecca. That's two. We don't see Obama praying five times a day (something else we most assuredly would have heard about, and that would have been passed around the Republican blogosphere and radio). There's three pillars. Nor have I seen Obama pronounce Iman, as he should if he is a Muslim.
So hence, even if Obama ever was or is now a Muslim, he is a severely backslidden one.