I call him Antipope Bergoglio (or just Bergoglio).
It gets tiresome, though, going down that rabbit hole with the uninitiated.
It’s also usually preceded by “probable false-prophet forerunner of the antichrist” and usually followed by “the arch-heresiarch”.
Something simpler, perhaps?
How about this…
A good friend was having dinner with his daughter for her birthday. She referred to the “faux pope”.
This got shortened to the…
Fauxpe
Brilliant! She gets all the gold stars!
Harvey Millican's Blog: Musings of a Trad Dad 