I agree that it's biblical imagery (there's early versions of it with more obviously biblical lyrics if I remember right) but the lyrics are also very suggestive of Samuel Delany's novel Dhalgren, which is set in a town called Bellona (which is out of "the country") and features among other things a literal "month of Sundays" and a heckuva lot of fire. I reckon one of them had just read it and thought it'd make good lyrics. (And they were right, 'cause "Bellona, Belladonna" sung like that is one of the best lines ever!)
I agree that it's biblical imagery (there's early versions of it with more obviously biblical lyrics if I remember right) but the lyrics are also very suggestive of Samuel Delany's novel Dhalgren, which is set in a town called Bellona (which is out of "the country") and features among other things a literal "month of Sundays" and a heckuva lot of fire. I reckon one of them had just read it and thought it'd make good lyrics. (And they were right, 'cause "Bellona, Belladonna" sung like that is one of the best lines ever!)