I think I bought this for Pictures at an Exhibition (Emerson Lake and Palmer were inevitably there first in my case, of course). Pictures was originally written for piano I later learned but Ravel scored it for orchestra, which seems much more natural somehow. The bonus was Stravinsky's Rite of Spring which is okay. Indeed, Russian ballet music tends generally to be attractive in my experience.
Bonhoeffer uses a similar phrase 'worldly Christianity'. It's J Gresham Machen that I want to line up most closely with. See his Christianity and culture here. Having done commentaries on Proverbs (Heavenly Wisdom) and Song of Songs (Heavenly Love), a matching title for Ecclesiastes would be Heavenly Worldliness. For my stance on worldliness, see 3 posts here.