I thought that what is going on in Scotland today would be a good excuse for a bit of Julie Fowlis. No prizes for guessing which way Julie has voted. I hope that not all proud Scots will agree as understandable as the yes vote is.
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.