I was amused to see this web page suggesting Gary Brady as a good combination of names for a baby. What struck me was the advertising in the left sidebar. Here's a good name for your baby, it seems to say, but do realise he will go bald!
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.