1970's folk/rock song please help identify

Hi. I was watching a movie from the early 70's last night. There was a scene where characters were watching a concert on TV -maybe The Midnight Special. The song starts out with a flute solo. Then the lead singer sings softly:

He preached the word of God
This man of God
But no one listened.
Cause on Sunday babies cried
Farmers dozed and ladies squeezed their Bibles.
A year of Sundays...

Does anyone have any idea what the title is and who sang it?

Thanks in advance!

Hi!
Do you remember the movie name?

It was "Sarah T.: Portrait of a Teenage Alcoholic" starring Linda Blair and Mark Hamil.

All I found was deadends for "Sarah T.: Portrait of a Teenage Alcoholic". James Di Pasquale composed the soundtrack but I could not find any information on the soundtrack (and no one is selling it on e-Bay).