Both, And, a Reflection on Romans 5:17-19

N.T. Wright, in his Paul, asserts that Paul's view is that the point of turning from idolatry and sin and to worship of the true and living God is "both that they might themselves be rescued and that through their rescue, and the new community which they then form, God's purposes to rescue the world world might be advanced."

He continues:

In Romans 5:17, Paul speaks of the justified "reigning in life"; the aim is not simply that they be rescued from disaster, but that through them God would rule his new creation. And this is why, too, the coming together of Jews and Gentiles in the one family is so central to justification.

In Paul's day, Christians argued over whether somebody had to be a Jew to be a Christian. Then as non-Jews began to be the largest, about the only, Christians, they began to discuss whether Jews were still included in God's care. In current times, Christians are arguing about whether Muslims are worshipping the same God. Then, with Rob Bell's new book, we are even arguing about whether those who don't profess a religion at all, or a different one, can be included.

How do Paul's words help in this argument? For example, verse 19, "...by the one man's obedience the many will be made righteous."