The melody reminds me of Grandpa Jones' version of 'Great Will Be the Coming of Our Lord'. Great parody. Really says it in plain English.

I also like Woody Guthrie's 'There'll Be No Church Tonight' as recently recorded by his grandaughter and her husband, and The Clamtones' very irreverent 'All Your Sins Are Forgiven (Now Let Me Down)' from a few decades ago.