I was out shopping this afternoon and I overheard a kid, seeing the chocolate Father Christmas, say "Oh look it's a black one not like the normal ones". I don't think anyone else heard him but me.
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.