This song is about the way state religion (established religion) replaced nature religion and about the consequences of these changes, mainly from the moral aspect.
lyrics
Dogma memorized literally,
Lesson still unlearned:
Man's got power over nature
For just a few psalms in return
The congregation of subjugation
The bargain has been made
Or so we expound
The Scriptures say it right out,
The canons of the council resound