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.
New Doctor Who - Offbeat suggestions
1. Jose Mourinho 2. Vince Cable 3. Boris Johnson 4. Psy 5. David Bowie 6. Julian Fellowes 7. Johnny Rotten 8. Danny Boyle 9. Shane McGowan 10. Prince Edward