Christ’s Ability to Sin and His Role as Second Adam

The core of your question is whether Christ's temptations and obedience were genuine and comparable to Adam's situation if, by virtue of his deity, he was incapable of sinning. The traditional theological terms here are "peccability" (Christ could sin) and "impeccability" (Christ could not sin).

I do not accept the premise that Jesus, during his earthly life, was incapable of sinning. Rather, Scripture presents him as one who could be tempted and did not sin. That distinction is crucial for understanding him as the true second Adam.

Real Temptation Requires Real Possibility

Scripture explicitly states that Jesus was tempted:

• He was tempted in the wilderness for forty days.
• Hebrews affirms that he was tempted in all points as we are, yet without sin.

Temptation, by definition, involves the pull toward something that is genuinely possible to choose. If an action is metaphysically impossible for a person, then the presentation of that action is not a temptation in the same sense; it is merely an empty display.

Therefore, if we affirm that Jesus was truly tempted "in all points like as we are, yet without sin," we must also affirm that, in his incarnate humanity, sin was a real possibility he could refuse. Otherwise, the statements about temptation become rhetorical flourishes rather than factual descriptions, and his identification with us in our struggles would be diminished.

The Incarnation and Adamic Likeness

Philippians 2 speaks to the nature of Christ's incarnation:

"But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men: and being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross."

Key points:

• He was made in the likeness of men and found in fashion as a man.
• He humbled himself and became obedient.

To function as the second Adam, he had to enter truly into Adamic human nature (without inheriting Adam's guilt or corruption), sharing in our weakness yet without committing sin.

Romans 5 sets the Adam-Christ parallel:

• By one man (Adam), sin entered the world and death by sin.
• By one man (Christ), righteousness and life are brought.

For that parallel to carry real weight, Christ must stand where Adam stood: as a true man who could choose disobedience but does not. If Christ is only appearing to face a choice he metaphysically cannot make, the analogy is significantly weakened.

Christ’s Victory as Genuine Human Obedience

On this understanding:

• Adam, a real man with the possibility of obedience or disobedience, chose disobedience and plunged humanity into sin and death.
• Christ, a real man, sharing our temptability, chose unbroken obedience, even to the point of death on a cross.

His victory is not merely the automatic outcome of his deity imposed upon a human shell; it is the perfect obedience of the incarnate Son who, in real human will, always aligns with the Father. When he says, "not my will, but thine, be done," there is a genuine human will that could desire a different path, yet submits.

Thus, the answer to your question is:

• If we insisted that Jesus could not sin in any meaningful sense, his temptations would be more illustrative than real, and the comparison to Adam's probation would be weakened.
• But if we understand that in his incarnation he truly took on human nature, was tempted as we are, and could have sinned yet never did, then his role as the second Adam is fully comparable and greater: he accomplishes in obedience what Adam failed to do.

So Christ's victory as the second Adam is genuinely comparable to and surpasses Adam's failure because he faced real temptation with real capacity to obey or disobey, and he chose perfect obedience at every point.

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