It was my privilege yesterday to be listening rather than preaching. We were listening to my son, Rhodri, in Alfred Place Baptist Church, Aberystwyth. Numbers are limited at the moment and the congregation was scattered across the building. He preached from Ezekiel 18 in the morning and that great text Zephaniah 3:17 in the evening. How good to hear your own son preach the Word faithfully. It was nice to chat with people outside afterwards. The services can be found here.
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.