The contrasting visions focus on a simple question: What, exactly, did we inherit from Adam and Eve's disobedience?
According to Original Sin, we inherit from Adam and Eve a congenitally defective nature, a nature enslaved to sin. Sometimes this view is called "total depravity."
According to Ancestral Sin, by contrast, what we inherit from Adam and Eve is mortality. We inherit death. Exiled from Eden, we are no longer connected to the Tree of Life and, thus, experience corruption and decay. This vision is described in Wisdom 1:13, which baldly states that "God did not make death." Rather, death entered into the world through the deceptions of Satan: "for God created us for incorruption, and made us in the image of his own eternity, but through the devil's envy death entered the world..."(Wisdom 2.23-24a).
In Romans, Paul also describes the spread of death to all of humanity through Adam's sin: "So then, just as sin entered the world through one man and death through sin, and so death spread to all people because all sinned" (Romans 5:12).
To be sure, the translation of that last clause muddies the waters a bit. The translation "because all sinned" is contested. As the NET translation notes describe:
The translation of the phrase ἐφ᾿ ᾧ (eph hō) has been heavily debated. For a discussion of all the possibilities, see C. E. B. Cranfield, “On Some of the Problems in the Interpretation of Romans 5.12,” SJT 22 (1969): 324-41. Only a few of the major options can be mentioned here: (1) the phrase can be taken as a relative clause in which the pronoun refers to Adam, “death spread to all people in whom [Adam] all sinned.” (2) The phrase can be taken with consecutive (resultative) force, meaning “death spread to all people with the result that all sinned.” (3) Others take the phrase as causal in force: “death spread to all people because all sinned.”
The first two options, eph hō taken as a relative clause or with consecutive (resultative) force, fit with the vision of Ancestral Sin. Due to Adam's sin, in whom all sinned, "death spread to all people." Or, because death spread to all people, the result was that all people sinned. This last reverses how we typically think of the cause-effect relation between sin and death. Specifically, instead of sin causing death, death causes sin. As it says in 1 Cor. 15:56: "The sting of death is sin." Sin is death's consequent and result.
This view--death as the cause of sin--fits the text I build The Slavery of Death around:
Since the children have flesh and blood, he too shared in their humanity so that by his death he might break the power of him who holds the power of death—that is, the devil—and free those who all their lives were held in slavery by their fear of death. (Hebrews 2.14-15)
Here in Hebrews 2, "the power of death" is wielded by the devil to keep us estranged from God. That specific power is described as holding us in slavery, all our lives, through the fear of death. This neatly fits the vision of Ancestral Sin. As biological creatures, death creates in us survival-focused fears and anxieties. In our post-Edenic situation, this death-saturated existence, Satan uses these anxieties to tempt us away from God.
The best exposition of this vision is the Orthodox theologian John Romanides' book Ancestral Sin. Here, for example, is Romanides describing how our fear of death becomes implicated in sin:
Through the power of death and the devil, sin that reigns in men gives rise to fear and anxiety and to the general instinct of self-preservation or survival. Thus, Satan manipulates man's fear and his desire for self-satisfaction, raising up sin in him...Because of death, man must first attend to the necessities of life in order to stay alive. In this struggle, self-interests are unavoidable. Thus, man is unable to live in accordance with his original destiny of unselfish love. This state of subjection under the reign of death is the root of man's weakness in which he becomes entangled in sin at the urging of the demons and by his own consent. Resting in the hands of the devil, the power of the fear of death is the root from which self-aggrandizement, egotism, hatred, envy, and other similar passions spring up.
In The Slavery of Death I describe these survival- and resource-based concerns as basic anxiety. These are the fears at the bottom of Maslow's hierarchy of needs. But in the book I go on to describe how Satan also uses existential anxieties to tempt us toward self-love. These are neurotic anxieties, higher up on Maslow's hierarchy, and are rooted in self-esteem and self-enhancement. As Romanides continues:
In addition to the fact that man, [as John Chrysostom has written,] "subjects himself to anything in order to avoid dying," he constantly fears that his life is without meaning. Thus, he strives to demonstrate to himself and to others that it has worth. He loves flatterers and hates his detractors. He seeks his own and envies the success of others. He loves those who love him and hates those who hate him. He seeks security and happiness and wealth, glory, bodily pleasures, and he may even imagine that his destiny is a self-seeking eudaemonistic and passionless enjoyment of the presence of God regardless of whether or not he has true active, unselfish love for others.
The point in making this contrast between Ancestral and Original Sin is that there are other ways of thinking about the Fall in Genesis 3 and what exactly we inherit from Adam and Eve's disobedience. To be sure, the causal relation between sin and death is complex and reciprocal. But by highlighting the reversal emphasized by Ancestral Sin--death (or the fear of death) causing sin--we can avoid some of the more morbid visions of human nature that have haunted Latin Christendom in the West. Human nature isn't "depraved" so much as anxious and weak. This anxious weakness inevitably leads to sin, keeping us stuck in a sin-death loop. We still need help to come to us from the outside. But our vision of human nature is more straightforward and realistic and doesn't require us to imagine human persons as congenitally damaged and broken.

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