How do we know Christ's atonement for sin is true?

The truth of Christ's atonement is grounded in His perfect life and sacrificial death, fulfilling the requirements of God's justice. Hebrews 2:10 explains that Christ became perfect through sufferings to serve as the captain of salvation. This notion of being made perfect relates not to His holiness, which He possessed inherently, but to the completion of His redemptive work. He took the sin debt of His people upon Himself, as Scripture indicates, and His resurrection further affirms this payment. Romans 8:33 assures that God justifies the elect, underpinning the truth that Christ's atonement is sufficient and effective for those He came to save.