I dropped off a friend at Luton Airport recently/ The charge (not announced beforehand) was £3. That is a scandalous scam. See here. Also here.
Given that I was only there 5 minutes, that is !
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.