Samuel Butler (1835 – 1902) is just a name to me I'm afraid. I am aware of his two most famous novels, the Utopian satire Erewhon and the semi-autobiographical novel published posthumously, The Way of All Flesh but have never thought about reading them. He is also known, they say, for examining Christian orthodoxy, substantive studies of evolutionary thought, studies of Italian art and works of literary history and criticism. Butler also made prose translations of the Iliad and Odyssey which remain in use today. He spent some years in New Zealand and led a somewhat complicated private life. He never married.
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.