Bit behind here. Eleven of us were there Wednesday as we looked at the final section in Haggai 1. Good interaction for once (I learned a lot). The fear of God and his "withness" are great themes. This is where things get going in Haggai. Oh for such a revival today. Good prayer time too with most praying.
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.