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.
Having got off tobacco onto art and preaching, etc, let me draw attention to a new link near the bottom of my sidebar featuring 'biblical' art - a new one everday.
I've also added one or two other things you'll see.