Sooo basically what you're saying is that you cant get there from here. This is one gigantic load. If the Judiciary does not have the authority to determine the eligibility of a candidate for the presidency according to the Constitution, then just who does?
Before the election, many states' election laws would have permitted a challenge to Obama's qualifications, if brought by another candidate on the ballot. This could have been done either by another Democratic candidiate during the primaries, or by McCain or a third party candidate during the general election. But no one brought such a suit, and the time to do so ran once the election was held. (It can still be done for 2012).
Once the election was held, Congress could have considered a challenge to Obama's qualifications when it certified the electoral votes, but no one objected.
At this point, the only way to remove Obama from office before 2012 is by impeachment.