However, relating to what Shaker said of RVW's attitude to the "Wrong-note School", you should try his 4th Symphony - full of fury and dissonance. Of this the composer said "I don't know if I like it, but it's what I meant"
The same with parts of Job. Not overdone though - in fact beautifully done. In other words, still music.
*I wonder if our dear BA would ever understand how an agnostic like RVW could respond to such 'spiritual' themes?
See also Verdi. And Delius
It should not be forgotten that the agnostic RVW edited the English Hymnal.
Another interesting piece by a nonbeliever is the Requiem by Gabriel Faure. I think that the final In Paradisum is so comforting and etherially beautiful that I would have it played at my - possibly humanist - funeral.