I was beginning to lose faith with Melvyn Bragg and In our time but the latest programme on the Trinity is worth a listen. See here. (I meant to thank Guy Davies for the tip off.
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.