“We have been inundated with the view that it doesn’t matter what you believe as long as you are sincere, and that all roads lead to heaven. Is God so narrow that He requires a strict allegiance to one way? But of course the framers of our document are faithful to the unambiguous teaching of Scripture. Affirmation 4 reads: We affirm that Jesus Christ is the only way of salvation, the only mediator between God and humanity (John 14: 6; 1 Tim. 2: 5). The corresponding denial reads: We deny that anyone is saved in any other way than by Jesus Christ and his Gospel. The Bible offers no hope that sincere worshipers of other religions will be saved without personal faith in Jesus Christ. Jesus declared to His disciples: “I am the way, and the truth, and the life. No one comes to the Father except through me” (John 14: 6). The Apostle Paul wrote that Christ is the only mediator between God and humanity: “For there is one God, and there is one mediator between God and men, the man Christ Jesus, who gave himself as a ransom for all, which is the testimony given at the proper time” (1 Tim. 2: 5–6). A mediator is a go-between, a person who stands in the middle between two parties, usually because they are estranged or involved in some kind of dispute. Throughout biblical history, particularly in the Old Testament, several people functioned as mediators. Moses, for example, was the mediator of the old covenant. He represented the people of Israel in his discussions with God, and he was God’s spokesman to the people as well. The prophets in the Old Testament also had a mediatorial function; they were the spokesmen for God to the people. They stood between the people and God, and so God would speak to or reveal Himself to the prophets. Then the prophets as intermediaries would say to the people, “Thus says the Lord.” The priests of Israel and the Aaronic priesthood of the Old Testament also functioned as mediators in that they spoke to God for the people. They were intercessors on the people’s behalf. Even the king of Israel was a kind of mediator because he was not ruling by his own inherent power, but he was God’s representative to the people. That’s why God held the king accountable to rule in righteousness according to the law of the Old Testament. In saying that Jesus Christ is the only mediator between God and man, Paul is not denying the office of these other mediators. He is instead focusing on the uniqueness of Christ’s mediatorial office in terms of the role of mediation. Christ’s role as Mediator is utterly unique, and that uniqueness is found not only in His work of mediation but in His person—Christ and Christ alone is the God-man. He is God incarnate, God with us. And what does God do to bring about reconciliation and redemption between God and humanity? God the Son takes on humanity and stands in the gap to bring about the reconciliation between God and His people. In that work of mediation, particularly with the work of atonement, Christ and Christ alone has the qualifications to do what is ultimately needed to bring about reconciliation.”
The Gospel of Jesus Christ: An Evangelical Celebration
https://learn.ligonier.org/articles/gospel-jesus-christ-evangelical-celebration
— What Is the Gospel? (Crucial Questions) by R.C. Sproul
