Parody or not, there are sedevacantists in the world:
> Sedevacantism is the position, held by a minority of Traditionalist Catholics,^[1]^[2] that the present occupant of the papal see is not truly pope and that, for lack of a valid pope, the see has been vacant since the death of Pope Pius XII in 1958. A tiny number of these claim the vacancy actually goes back to the death of Pope Pius X in 1914.
I think you're referring to the video, Antipope Francis practices Judaism, http://www.youtube.com/watch?v=4AMrXtj8AJY. If you pray Jewish prayers and observe Jewish holy days then you are practicing Judaism. I guess this concept is too complex for people like you to understand.
Yes, I'm saying that this is different than that sort of thing. Its not a thing that can be made in to a "shocking video exposing the truth". Its where the supermajority already accepts it as so much the truth that they don't even bother talking about it.
Its the difference between "the pope is secretly a Jew!" and "the wall is there to keep the jealous westerners out of our communist worker's paradise".
http://www.youtube.com/watch?v=Cf84Hwo_Umk