I think I bought this one for the Gershwin which I heard in some bowdlerised form first. Addinsell's Warsaw Concerto I first heard on an early live recording of the Carpenters that we had at home. The Litolff Scherzo and Liszt Fantasy never got much of a hearing.
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.