Melvyn Bragg has been at it again discussing the Morning Star of the Reformation, John Wyclif(fe) with the experts on Radio 4. See here for the podcast. Also see here. The experts on this occasion are Sir Anthony Kenny (philosopher and former Master of Balliol College, Oxford), Anne Hudson (Emeritus Professor of Medieval English at the University of Oxford) and Rob Lutton (Lecturer in Medieval History at the University of Nottingham).
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.