We hear that polymath Jonathan Miller has died. I found myself sitting next to him at the British Library once and resisted the urge to graffitti his notebook when he left his space for a while. His views on atheism can be found in a 2007 article here.
The similar phrase 'Worldly Christianity' is one used by Bonhoeffer. 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.