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.
My Brother Jake
We heard this week of the death of Andy Fraser co-writer of my favourite pop track of all time, My Brother Jake. This is a live version from the time (Fraser is on piano). For a more modern (much less satisfying) version try https://www.youtube.com/watch?v=tP4i8s76W4U