Tip of the old scrub brush to Disciple/Methodist David Bates, with whom I used to enjoy singing bass on the back row of the choir.
From a 2010 production of Austin City Limits, Steve Martin joins the Steep Canyon Rangers in an a capella singing of the entire atheist hymnal.
Atheists have a very witty lyricist.
Update: “Austin City Limits” asserted its copyright on that version (might be available at their website). Here’s the song from a handheld camera at Merlefest, courtesy of Freedom Tuners:
Also via Boing-Boing; credit where credit is due.
Posted by Ed Darrell 
Millard Fillmore's Bathtub 