“What’s the main religion of most ghosts?”/“Boo dism.”

A religion riddle is:
     
Q: What’s the main religion of most ghosts?
A: Boo dism.
   
Forms of the pun on “Buddhism” have been cited in print since at least 2004.
   
   
Wikipedia: Buddhism
Buddhism (/ˈbʊdɪzəm/, US: /ˈbuːd-/) is the world’s fourth-largest religion with over 520 million followers, or over 7% of the global population, known as Buddhists. Buddhism encompasses a variety of traditions, beliefs and spiritual practices largely based on original teachings attributed to the Buddha (born Siddhārtha Gautama in the 5th or 4th century BCE) and resulting interpreted philosophies.
     
Google Groups: alt.august
Re: 8.3 in CHINA!!!!!!
Damon Hill
Oct 31, 2004, 2:15:20 PM
(...)
What religion do ghosts practice?
Boo!-dism.
   
Google Books
Puns Spooken Here:
Word Play for Halloween
By Richard Lederer
Charleston, SC: Wyrick & Co.
2006
Pg. 28:
Favorite religion:
Boo-dism
 
Twitter
danny
@_dansov
What’s a ghosts favorite religion? BOOdism! #LOL #fun
9:39 PM · Jul 27, 2012·Twitter for Android
   
Twitter
David Ochart
@DavidOchart
What is Casper the ghost’s religion?
BOOdism!
#awfulhalloweenpuns
12:40 PM · Oct 20, 2013·Twitter for Android
   
Twitter
Annie Riehl
@ladysamebrain
My husband told me a joke, “What religion do ghosts follow? BOOdism.” LOL!
10:46 AM · Oct 29, 2013·Twitter for Android
 
Reddit—Jokes
Posted by u/pablosnazzy January 15, 2017
What’s the main religion of most ghosts?
Boo dism
 
Twitter
WTBA “Cocaine Hippo”
@chillicothe20
Joke for the kids out there:
What religion do ghosts practice?
BOOdism
6:03 AM · Sep 7, 2020·Twitter for Android
 
Facebook
Daniel Holschauer
February 1, 2021 at 4:50 AM ·
What’s the main religion of most ghosts?
Boo dism