Why is the atonement of Jesus Christ important?

The atonement of Jesus Christ is fundamental to the gospel, affirming that His sacrifice on the cross effectively paid for the sins of His people. It is described as powerful and particular, signifying that Christ died as a substitute for His elect. Scripture supports this, asserting that the blood of Jesus cleanses from all sin (Hebrews 10:17) and validates that none for whom He died will ultimately perish. Thus, the efficacy of Jesus' blood provides a solid foundation for believers' assurance of salvation.