I got round to reading Brave New World by Aldous Huxley the other day. It's another of those novels you feel you ought to have read by now. Well, there it is done. Written in the early thirties it is a dystopian novel of the future (2054) that makes a number of telling points about mass production, promiscuity, the search for happiness, etc. One of my sons has made a study of the genre and suggested to me that although Huxley's ideas are very good George Orwell (1984) is probably just a better write. I think there is a lot in that. (The title, of course, is from Shakespeare's The Tempest. The title is not just chosen at happy random).
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.