Those are ooooooold jokes with the religions/professions changed.
Stand Up Comedy about JWs
I heard this one from Garrison Keillor on "A Prairie Home Companion:"
A Jehovah's Witness converted to Unitarianism. So he went from door to door for no particular reason.
Did you hear about the dyslexic agnostic insomniac?
He stayed up all night wondering if there was a dog.