How do we know that Jesus' sacrifice atoned for our sins?

The resurrection of Jesus is a fundamental truth of Christian doctrine that confirms His sacrifice was accepted by God as atonement for our sins. Romans 4:25 states, 'who was delivered for our offences, and was raised again for our justification.' His resurrection signifies that sin has been conquered, and the payment for our iniquities has been satisfied. Furthermore, the imputation of our sins to Christ and His righteousness to us establishes the assurance of our salvation, as described in 2 Corinthians 5:21: 'For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.' This divine exchange is the essence of the gospel.