William Wilkie Collins (1824 – 1889) was an English novelist, playwright and author of short stories. He was very popular during the Victorian era and wrote 30 novels, more than 60 short stories, 14 plays, and more than 100 nonfiction essays. His best-known works are The Woman in White, The Moonstone, Armadale, and No Name. I've only attempted the second of these I'm afraid. He was a lifelong friend of Dickens and a number of his works were first published in Dickens's journals All the Year Round and Household Words. The two collaborated on several dramatic and fictional works, and some of Collins's plays were performed by Dickens's acting company.
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.