Spotted at my local Waterstones. B B Warfield wrote that the Reformation was the triumph of Augustine's doctrine of th grace (Whichch Protestants love him for) over his doctrine of the church (which Romanists love him for). [The book on Augustine is by Robin Lane Fox].
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.