“Prophet” is sometimes used in business puns for the word “profit.” “Atheism is a non-prophet organization” is a joke that has been cited in print since at least 1988.
 
A riddle was posted on Reddit—Jokes in 2017:
 
Q: What do you call an atheist business?
A: A non-prophet organization.
 
 
14 February 1988, The Advocate (Newark, OH), “Celibacy is not hereditary by Eric Anderson, pg. 4A, col. 5:
Atheism is a non-prophet organization.
   
Google Books
More Holy Hilarity:
Inspirational Wit and Cartoons
By Cal Samra and Rose Samra
Colorado Springs, CO: WaterBrook Press
1999
Pg. 15:
Atheism: a non-prophet organization. —via Rev. Karl R. Kraft, Mantua, New Jersey
 
15 June 1995, The Globe and Mail (Toronto, ON), “Morning smile,” pg A1, col. 1:
Atheists’ club: a non-prophet organization.
 
18 May 1997, Idaho Statesman (Boise, ID), “The Buzz,” pg. 1D:
Atheism is a non-prophet organization.
 
Google Groups: alt.humor.puns
Puns of the Weak Special: 100 Top One-Liners
Stan Kegel
5/25/03
The 100 best one-liners as chosen by the readers of Mike Bull’s “Pun of the
Day” http://www.punoftheday.com
(...)
41. Atheism is a non-prophet organization
 
Google Books
Atheism: A Non Prophet Organizationr
SEIKO
Lulu Press, Inc, Mar 3, 2015 - Religion
The mind of the ordinary man is in so imperfect a condition that it requires a creed; that is to say, a theory concerning the unknown and the unknowable in which it may place its deluded faith and be at rest. Science, then, commands our respect, not on the basis that its present assumptions and deductions are absolutely and for all time true, but on the ground that its method is for all time true—the method of discovery, the method of observation, research, experimentation, comparison, examination, testing, analysis and synthesis.
 
Reddit—Jokes
What do you call an atheist business?
submitted May 26, 2017 by TurboTitan92
A non-prophet organization.