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 culturehere. 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.
I hear Pete Seeger has died. See here. I was looking for a version of Turn Turn Turn but spotted this. I remember my mother singing this gospel song that he re-discovered. I notice it includes the line "meet my mother on the other side". You betcha.