Adam: Whose Sin Became Our Sin

"[T]he problem with the human race is not most deeply that everybody does various kinds of sin. Those sins are real, they are enough to condemn us, and they do indeed play a role in our condemnation. But the deepest problem is that behind all our depravity and all our guilt and all our sinning there is a deep mysterious connection with Adam, whose sin became our sin and whose judgment became our judgment. And the Savior from this condition and this damage is a Savior who stands in Adam's place as a kind of second Adam (or "the last Adam," 1 Corinthians 15:45)" (John Piper, Counted Righteous in Christ, 102-103).