John Cornelius Stam (1907 – 1934) and Elisabeth Alden Scott Stam, aka, "Betty" (1906 – 1934) were American missionaries to China with CIM (now OMF), during the Chinese civil war. The missionary couple was murdered by Communist Chinese soldiers in 1934. The story of their martyrdom was much publicised and inspired many to become missionaries.
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.