Why is belief in Christ essential for Christians?

Belief in Christ is the cornerstone of Christianity; as John 20:31 states, the purpose of the miracles and signs recorded in Scripture is that we might believe that Jesus is the Christ, the Son of God, and by believing, we may have life through His name. A person's relationship with God hinges on their faith in Jesus, who is the only mediator between God and man (1 Timothy 2:5). This faith is not merely intellectual acknowledgment but involves trusting Christ fully for salvation and the ongoing work of grace in our lives. Therefore, belief is an essential response to God's grace and the work of the Holy Spirit, enabling believers to live in the fullness of salvation and relationship with Him.