What is the Biblical Evidence for the Imputation of Adam's Sin?

The doctrine of the imputation of Adam's sin means that when Adam first sinned, that sin (and its blame) was rightly regarded by God to be our sin as well. John Piper writes:

The problem with the human race is not most deeply that everybody does various kinds of sins—those sins are real, they are huge and they are enough to condemn us. Paul is very concerned about them. 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. (John Piper, "Adam, Christ, and Justification: Part 1")

God ordains that that there be a union of some kind that makes Adam's sin to be our sin so that our condemnation is just. ("Adam, Christ, and Justification: Part 5")

The biblical basis for this doctrine of imputed sin is discussed thoroughly in John Piper's five sermons on Romans 5:12-21. Here we will simply seek to summarize some of the primary evidence from this text.

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