Andrew Errington has had a crack at summarising Romans. Looks pretty good.
Here’s a snippet:
1:1–17 You want to hear some good news? It’s found in Jesus, the Saviour King. In him and his story God has acted to save people like you and me precisely by being righteous.
1:18–32 But first some bad news. God is justly furious at human wickedness, especially human failure to honour him as Creator; and unfortunately, people have no excuse.
2:1–11 Those who see this and cast judgment, though, are equally without excuse, because no partiality on God’s part will alter his judgment according to how lives have been lived.
2:12–29 There is, that is to say, no a priori distinction between Jews and Gentiles: judgment is by works. So the mere realities of circumcision and possession of the Law do not save of themselves!
3:1–8 That doesn’t mean the Jews have no privilege at all. Yet they are not thereby safe. Stay posted on this one!
3:9–20 What this amounts to is that when it comes to ultimate judgment, the Jews have no advantage, for all are under sin. No one, even and indeed especially (!) those under the Law, is righteous before God.
3:21–26 But the good news is: God’s righteousness, by which through the atoning death of Christ he is both just and justifies everyone who has faith in Jesus.