I notice that there are J C Ryle items all over the internet. Ryle wrote many tracts and many of these were combined to form books. It can be confusing sometimes to know what is where. Among his many writings are those that deal with church history, mainly in biographical form. perhaps the best two items I have noticed are Ryle's Light for old times and many other titles of his in mobi and epub format here on this page (look for Ryle) and this long list of tracts and other things (187 or more) with a link to his books on Amazon 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.