A Nigerian couple in membership at the church are celebrating their fiftieth wedding anniversary and we were kindly invited to a celebration in a nearby Chinese Restaurant. They have seven children so we were a good number. (The other week another couple celebrated 40 hears of marriage. We are on a mere 33).
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.