I was in a park in Aberystwyth when I saw two dog owners chatting. They looked quite different (young/old, black/white, etc). It was the dogs (Labradors black and chocolate) that they had in common. I heard the one man ask the name of the other's dog and was told it was Fletcher. He repeated the name several times, rolling it around his tongue. He seemed to be looking for a meaning in it beyond the mere sounds. It was an interesting question as I guess he will have little reason to use it. Nevertheless, there is something in us that wants to name things. If I come into contact with a dog, I want to know its name. It's natural.
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.