What is the grammatical role of "religious meaning of folk art"?

He technically should have used Capitals, just as you said.

however, it is possible that the author did not use capitals to express his opinion as something other than a statement or a sentence. By refusing to use a capital, the "Sentence" is not really anything more than words on paper.

He could have refused to use a Capital, denying grammatical rules, so that He could stipulate that his "opinion" is not FACT, nor does he Believe in It ~ It is just something that he thinks.

"-there is no integration of bearing on peasant superstition." is a remark I entirely agree with. Considering of course, that "-NO-" is an over exaggeration. The artwork is filled with metaphors, illustrated by those who have vague understandings of the philosophies, and are "illustrating a philosophy!"

Thanks.
Let's see what others will remark.

This ^ is part of a sentence which started on the previous page. You need page 656 to know what the rest of the sentence is.