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 culturehere. 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.
A question on University Challenge tonight concerned names for moustaches for men. They showed four pictures and asked what the styles were. Let me try you.
Answers (written backwards to disguise them)
1. rab eldnah 2. hsurbhtoot 3. Uch Nam Uf 4. licnep