Elvis, Madonna, Beyonce, Oprah, Bono. Some celebrities become so famous that one name is enough. It even happens among ministers. I noticed at the Banner Conference this year peiple simply said Sinclair there was no need to add more. Weel, surprisingly I discover that I too have reached that dizzy height if the latest edition of Foundations (74) is to be believed. See here.
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.