It is not that unusual for me to be in Whitchurch, Cardiff but I was on Saturday and for the first time I noticed this mural created in 2016 not far from Bale's old school (same school as Sam Warburton and Geraint Thomas).
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.