Robert Louis Stevenson (1850 – 1894) was one of those names my mother expected you to know when I was a kid. A Scottish novelist, poet, essayist and travel writer his most famous works are Treasure Island, Kidnapped and The Strange Case of Dr Jekyll and Mr Hyde. Others include The Black Arrow, The Master of Ballantrae, Catriona and The weir of Hermiston. A celebrity during his own lifetime, Stevenson ranks among the 26 most translated authors in the world. His works have been admired by many other writers. G K Chesterton said of him that he "seemed to pick the right word up on the point of his pen, like a man playing spillikins." Iain Murray rightly warns against him in The Undervcover Revolution.
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.