I spotted a fascinating story in the paper yesterday. The basic story is how a sceptical scientist got his dog onto the editorial board of various science journals. Eschewing use of the dog's picture he provided this snap of Kylie Minogue in glasses for this one above. Full story here.
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.