How do we know that Christ's obedience is central to salvation?

Christ's obedience is the cornerstone of our salvation, as highlighted in Romans 5:19, where we learn that through one man's disobedience, many were made sinners, so by the obedience of one shall many be made righteous. Jesus Christ, the second Adam, came to fulfill the law and produce a perfect righteousness on behalf of His people. He submitted perfectly to the Father's will, even to the point of death on the cross (Philippians 2:8). Moreover, His willingness to bear the penalty for sin—representing His people—demonstrates that salvation is achieved through His obedience. This truth is confirmed in Hebrews 10:10, which states that we are sanctified through the offering of the body of Jesus Christ once for all. Therefore, it is Christ's achieving obedience that secures the eternal redemption of His chosen ones.