We had our last session on Unseen Realities last night. Eleven of us gathered and we looked again at Satan and the fact he is bound. I think people were happy with the line I took, beginning with Matthew 12:29. We had a full prayer time with mostpeople praying before the close. Four of us present are preaching in various places on the coming Lord's Day.
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.