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.

Heidelberg Catechism 27, 28

Ursinus (main author of HC)
I am not familiar with the Heidelberg Catechism but in this 450th anniversary year, we are trying to get to know it. These two Q&As are excellent.
27. What do you understand by the providence of God?
The almighty, everywhere-present power of God, whereby, as it were by His hand, He still upholds heaven and earth with all creatures, and so governs them that herbs and grass, rain and drought, fruitful and barren years, meat and drink, health and sickness, riches and poverty, indeed, all things come not by chance, but by His fatherly hand.
28. What does it profit us to know that God created, and by His providence upholds, all things?
That we may be patient in adversity, thankful in prosperity, and for what is future have good confidence in our faithful God and Father, that no creature shall separate us from His love, since all creatures are so in His hand, that without His will they cannot so much as move.