My dad liked a game of cards from time to time and we had an old home made cribbage board which I have featured here before in the house. I was familiar with it for years before I knew what it was for. The very word cribbage takes me to my dad, I guess.
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.