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 culturehere. 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.
Brian May on Akkerman etc
Though never quite a fan of Brian May one admired his sound and this interview on the night he was given the Eddy Christiani award in Holland earlier this summer is a serious, modest and interesting one.