In the course of preparing last weekend I came across this tremendously encouraging article from Coventry on the FIEC website. I think we can all be encouraged by this. I know Ben Holmes to speak to. He's a lovely bloke. Steady Blessings.
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.