In Yorkshire again this weekend and again at a wedding. This time, it was Pieter de Jong, who grew up in Childs Hill, and Coralie Severs. My oldest son is Pieter's lifelong friend and he was best man. My niece is a good friend of Coralie's and was one of a host of bridesmaids. It was a great day.
Bonhoeffer uses a similar phrase 'worldly Christianity'. 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.