Two recent deaths in America caught my eye. Firstly, Bob Montgomery a music producer who worked with and wrote for Buddy Holly in Texas in their early days. Secondly, Ralph H Baer, who was a pioneer in video games including The Simon. I have fond memories of being a student and playing Simon at the manse where my future wife was resident. I'm sure we've featured it on the blog here before.
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.