Read this new book on The Beatles last week. I found it a little difficult to know what was what as Craig Brown is a well known satirist. I think he play mostly with a straight bat here. The story is just phenomenal. (Some caution recommended in light of the content).
The similar phrase 'Worldly Christianity' is one used by Bonhoeffer. 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.