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 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.
10 very similar French and Welsh words
1. pont/pont Bridge 2. église/eglwys Church 3. mer/môr Sea 4. triste/trist Sad 5. fenêtre/ffenestr Window 6. terre/tir Land 7. une/un One 8. toi/ti You 9. boue/baw Mud 10. livre/llyfr Book