These are not really Christmas songs but winter ones.
To hear them go here.
1. River Joni Mitchell
2. Winter time Kayak
3. Winterborn lyric Jan Akkerman
4. Drive the cold winter away Horslips/Kate Rusby
5. The throat of winter Tyrannosaurus Rex
6. Midwinter night Tangerine Dream
7. Trains and winter rains Enya
8. Flight of the snow goose Camel
9. Winter time love The Doors/Bojoura
10. Hazy shade of winter Simon and Garfunkel/Bangles
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.