In Christ: The true and better Adam

In Romans 5:12-21 we see that we are able to have the life-changing results of justification by faith alone because we are no longer in Adam but in Christ, the second Adam.

John Piper helpfully shows how Adam & Christ compare in Romans 5:12; 18-19.

"Just as through one man [Adam] sin entered the world
     (and death through sin)
          and sin spread to all who are in Adam,
              because all sinned in Adam
                   and his sin was imputed to them,

so also through one man, Jesus Christ, righteousness entered the world
     (and life through righteousness)
          and life spread to all who are in Christ
               because all were righteous in him
                    and his righteousness is imputed to them.

Piper, Counted Righteous in Christ: Should We Abandon the Imputation of Christ’s Righteousness?, in The Collected Works of John Piper, ed. David Mathis and Justin Taylor (Wheaton, IL: Crossway, 2017), 5:356.