John Bunyan (1628 – 1688) was an English Puritan preacher, best known for his book The Pilgim's Progress, written in prison for nonconformity. He wrote many iother excellent books. A member of an Independent church in Bedford, he has been described both as a Baptist and as a Congregationalist, though he himself preferred to be described simply as a Christian. More here.
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.