One of my sons yesterday was off to an exhibition in the Oxo Tower wharf by the Thames. The exhibition closes very shortly I'm afraid but the details are here. He was one of the contributors to his school's effort for the Rivers of the world project.
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.