I happened on a programme tonight that kept me watching longer than I might have thought. It was BBC 4's Reggae Britannia. See more here. I enjoyed Ken Boothe's 1974 hit, a version of Bread's Everything I own. . (I always want to sing I would give anything I own, Give up my life, my mobile phone, I would give ev'rything I own, Just to have you back again).
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.