ACTS 4:12.--Jesus Christ is the only name given whereby man can be
saved.
JOHN 3:5-7.--A man must be born of the water and of the Spirit before
he can enter the Kingdom of God.
This birth of the water (baptism) presupposes faith and repentance. As
the vast majority of the race have never heard of Christ or His gospel
in this life, it follows that they must hear of them in the spirit
world.