Last night Eleri and I went to see the film everyone is talking about. It is brilliantly done and absolutely fascinating on many levels (politics, providence, how little we know about the recent past, stammering, etc). I had not realised that in one or two sections there are strings of profanity and so the film needs to be approached with caution.
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.