How do we know that salvation is through faith in Christ?

The New Testament consistently affirms that salvation comes through faith in Jesus Christ, who fulfilled the law in our place. In Galatians 3:13, it states that 'Christ hath redeemed us from the curse of the law,' indicating that His sacrificial death satisfies the penalty required for our sins. Additionally, His resurrection serves as concrete proof of victory over sin and death (Romans 4:25). Therefore, our justification—being declared righteous before God—rests not on our adherence to the law but solely on faith in Jesus’ completed work at Calvary.