Meaning of Believing in Christ Jesus
Christ Jesus apparently thought that life after death was real. So, believing in Christ Jesus means believing in life after death.
But life after death is either in Heaven or the hell according to Christ Jesus. So, believing in Christ Jesus means understanding how to be allowed to enter the Heaven.
Accordingly, if you truly believe in Christ Jesus, you will have no fear for death, at least, in principle.
But what is the spiritual world that must exist above this material world? Probably to make us concentrate on life in this world, Christ Jesus did not reveal specifically the real state of the spiritual world.
What is more important is believing in Christ Jesus means believing existence of God.
So, believing in Christ Jesus itself is salvation of our souls.
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Mat 9:27 And when Jesus departed thence, two blind men followed him, crying, and saying, Thou son of David, have mercy on us.
Mat 9:28 And when he was come into the house, the blind men came to him: and Jesus saith unto them, Believe ye that I am able to do this? They said unto him, Yea, Lord.