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.
Banner 2015 - Five Minutes of fame
Jeff Kingswood, Alan Davey, Stuart Olyott, GB, Kevin Deyoung, Geoff Thomas
(I deliberately stood between Stuart Olyott and Kevin DeYoung to impress my sons)