Here's something I came across on my recent travels - a plaque marking the site of a baptistry used in the 18th century by the Baptsts of South Craven. The South Craven Baptist Church currently occupies a modern building opposite the beck where baptisms took place in times gone by. The church started in 1711.
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.