Why is believing in Christ alone essential for salvation?

Salvation through belief in Christ alone is fundamental to Reformed theology because He is the only one who fulfills the law's requirements and achieves atonement for sin. Romans 3:21-22 tells us that righteousness is available apart from the law and is received by faith in Jesus Christ. The law exposes our sinfulness and incapacity to achieve righteousness on our own, thereby guiding us to place our faith in Christ. By coming to him in faith, we receive the gift of salvation and are justified before God, which is unattainable through human effort.