How do we know that salvation comes through Jesus Christ?

The assurance of salvation through Jesus Christ lies in the core message of Romans 5:19, where it states that through the obedience of one man, Jesus, many will be made righteous. Unlike Adam, whose disobedience brought sin and death into the world, Christ's faithful obedience unto death enables the possibility of redemption for believers. This contrasts the outcome of Adam’s fall with the hope set forth in Christ's atoning work, demonstrating God's redemptive plan for humanity. As we embrace faith in Christ, we are assured of our righteousness not through our works but solely based upon His accomplished work on the cross.