There are a number of books on covenant theology available at present. Just a few of them are actually by Baptists! This one is a composite thing beginning with a long article by Earl Blackburn and shorter ones by Fred Malone (Hermeneutics) and Walt Chantry (works, imputation and baptism). It is a real joy to read a book where you agree with almost everything unlike the usual experience where the Presbyterian suddenly heads off in a direction that you have no wish to go in. The book is really worth reading. It not only has the baptism debate in mind but also dispensationalism and new covenant theology, a movement that is quite strong among Baptists. The book accepts the existence of a covenant of works. Chantry links Jonathan Edwards with the views of John Cameron on page 122. It might be useful to know more about that.
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.