[For] there is one God, and there is one mediator between God and men, the man Christ Jesus —1 Timothy 2:5
Jesus is the one mediator between God and man. 1 Timothy 2:5 raises some important questions about the exclusivity of Jesus Christ. John Piper addresses this subject in chapter 4 of Let the Nations Be Glad. He writes:
The crucial point here is the universality of the work of Christ. It is not done in a corner with reference merely to Jews. The work of Christ, the second Adam, corresponds to the work of the first Adam. As the sin of Adams leads to condemnation for all humanity that are united to him as their head, so the obedience of Christ leads to righteousness for all humanity that are united to Christ as their head—”those who receive the obedience of grace” (v. 17). The work of Christ in the obedience of the cross is pictured as the divine answer to the plight of the entire human race.
Also see John Piper’s book, Jesus: The Only Way to God.