do you really take revelation literally? there are some books in the Bible that are written in a metaphorical sense. these are great authors, expressing what they've seen in a very fantastic way, but most of the apocalyptic literature in the Bible, are not meant to be translated literally. it is more probable that revelation should be interpreted as a book that shows us what to expect from the time Christ ascended, until His return, not necessarily a specific period in that entire time frame (then of course the last chapter covers what will happen, again in a metaphorical sense, after His glorious return). so the antichrist that is mentioned in revelation is probably better interpreted as anyone who persuades people away from Christ and His truth.
considering earth's size, if stars started falling onto earth from the heavens, then earth would be obliterated. these wraths that God pours out, are mere symbols of what it is like when God pours out His wrath on sinners (which if we look to romans, his wrath seems to be less of the pain he actually inflicts on us, and more of that fact that He let the hardened heart go so far away from Himself that it is now self-inflicted pain, due to the immense pain we would experience with a life without him).
so to answer your question, considering that Obama professes Christ as His savior, then no i could not believe that he is the antichrist, at least no more than the rest of us.