It's good to hear that the Lions, despite predictions, have held the mighty All Blacks to a series draw in their own back garden. I managed to see the second half of the final match somehow and a thrilling festival of rugby it was. The final score was 15-15. A final (correct) refreeing decision (scrum not a penalty) made a difference).
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.