Creative Minority Report notes the dead Pope-Joan-myth dog still wags its tail. Commentor John Hetman notes its resurgence on the heels of Lent. Another commentor, Foxfier, suggested an Anti-Catholic liturgical calander to remind writers what topics to cover. Rough sketch:
Christmas time: “Was Mary a Virgin?” “How many brothers did Jesus have?” “Was Joseph Jesus’ biological father?”
Lent: Pope Joan, some sprinkles of modified Galileo on anniversaries of Darwin.
Easter: “How many children did Jesus have?” “Who really died on the cross?” “The Historical Jesus: did he ever live?”
Ordinary Time : “Inquisition!” “Millions– no BILLIONS– were killed by the Church in the dark ages/as witches/ as Jews/ as heretics!”
There has to be more; can anyone else add?
I’d say that during Christmas time, there is always a “Jesus was probably really born [insert anything other than December 25th]. As a question of fact, it is not that objectionable, but these people just have to rain on the season somehow.

Hehe, hopefully someone will be able to go a bit further than a one-off gag.
Dang I wish I could draw…. I’d sketch one up and send it to Curt Jester.