My wife likes this. I looked for it on Youtube some time back and couldn't find it but it is there now. I remember watching Ryan and Ronnie (in English) as a boy. They were very funny.
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.