Why is Christ's righteousness imputed to believers?

Christ's righteousness is imputed to believers as a foundational aspect of salvation. This concept is articulated in 2 Corinthians 5:21, where it states that God made Christ to be sin for us, so that we might be made the righteousness of God in Him. This imputation signifies that when a believer puts faith in Christ, they receive Christ's perfect obedience and righteousness, thus being declared righteous before God. The righteousness of Christ is perfect and sufficient to satisfy God's justice, allowing believers who trust in Him to stand faultless and assured of their position in God's sight.