I have a book called "Jesus Christs", by A.J.Langmuth (Ballentine, 1969) which is a 'novel'consisting of imaginary interludes from the life of Jesus....the opening paragraph goes like this:

"I have come to die for your sins", Jesus told a stooped figure passing him on the road.
"Then what am I to die for?", the old man asked.
Jesus took a small notebook from his pocket and copied the question. "If I may have your name and address", he said, "an answer will be sent to you".

the book is not exactly 'humor', but uses humorous elements to illustrate whatever its message is..(and thatis not exactly clear)