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.
> 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.
http://en.wikipedia.org/wiki/Sedevacantism
The belief the Pope is a Jew is a new one on me, but the general tenor of "There is no valid Pope; the current one is a pretender." is no new idea.