Richard Barcellos's meticulous little book on the Lord's Supper is not an easy read. He makes his point clearly and convincingly, however. Some of us are tempted to say that the Lord' Supper is only a memorial. Barcellos argues well here that we cannot stop with that statement. Whether we are full blown Calvinists on this or not, there is something more going n and the supper is a means of grace in which the Spirit himself blesses those who come in faith.
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.