Like Mark, I believe that "We Need A Whole Lot More of Jesus" was written as a serious song. Now, "Plastic Jesus" was not, it seems to me. Then there's "Jesus Was A Capricorn", which, while not a religious song, is serious about how Christ's real message gets twisted by Christians.

Jesus was a Capricorn, he ate organic foods.
He believed in love and peace, and never wore no shoes.
Long hair, beard and sandals and a funky bunch of friends.
Reckon they'd just nail him up if he came down again.

Chorus
'Cause everybody's got to have somebody to look down on,
Who they can feel better than at any time they please.
Someone doing something dirty decent folks can frown on.
If you can't find nobody else, then help yourself to me.

Who wrote this, BTW? Kristoferson? Ochs?

Jerry