Why is belief in Jesus Christ necessary for salvation?

Salvation is contingent upon faith in the Lord Jesus Christ because He is the sole mediator between God and man. Romans 10:9 states that confessing with your mouth that Jesus is Lord and believing in your heart that God raised Him from the dead leads to salvation. This is because through Christ's death and resurrection, He dealt with the penalty for sin, allowing for justification and reconciliation with God. Belief in Jesus is thus the only means by which a person can be justified and receive eternal life.