What does it mean to say that Christ's death accomplished our salvation?

When we speak of Christ's death accomplishing our salvation, it refers to the belief that through His sacrificial death, He took upon Himself the sins of His people, offering a complete atonement. 2 Corinthians 5:21 affirms that Christ became sin for us, so that we might become the righteousness of God in Him. This means that Christ's atonement not only cancels the penalty for sin but also positively grants righteousness, enabling believers to stand justified before God. Furthermore, through His resurrection, believers receive assurance of their own future resurrection and eternal life.