I ended up not making an entry last week for some reason. Anyway we've been carrying on in Matthew 4 (the beginning of his ministry and the call of the first disciples) and Esther, which we have now finished. The final two sermons on Esther were on God's power to change things and the coming day of judgement. We had lunch together on the 9th and yesterday we had communion in the evening. The sermons this Sunday were very evangelistic and it was good to have people there for whom that was appropriate.
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.