Thanks to regulars Alan and Tom, to any lurkers and to Reimer (though I do like talented show offs myself and would dissociate myself from any suggestions of anti-semitism) and Moshable and Jason. I've had a nice time away but good to be back.
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.