I do a good deal of walking these days, usually to Highgate and Hampstead. Normally, I don't see anyone famous. Then last week I passed comedian Alan Davies talking to someone about football as he took his kids to school one day and then on another day passed another comedian Terry Jones of Python fame, eliciting nervous hello in response to my beaming smile. Hat trick this week perhaps.
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.