In those days Ihon the Baptiser, came and preached in the wilderness of jury saying: repent, the kingdom of heaven is at hand. This is he of whom it is spoken by the prophet Isay, which saith: The voice of a crier in wilderness, prepare the Lord's way, and make his paths straight.
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.