When a person believes in the biblical Jesus for salvation, they are believing that Jesus is holy God Incarnate (that He is God and man), that Jesus shed His blood, was crucified, died on the cross for the forgiveness of all of our sins (past, present and future), that He was buried, and that He rose again from the dead on the third day, according to the Scriptures.
Those who believe in this Jesus, automatically and unavoidably and immediately, receive: eternal salvation, eternal life, forgiveness of all their sins, Heaven, a new self indwelled by Christ, a new holy identity, God as their Heavenly Father, and the indwelling Holy Spirit.
It is not enough for salvation for a person to believe in a Jesus who is not God (Mormons and Jehovah’s Witnesses), or in a Jesus who is a sinner.
It is not saving faith to believe that salvation comes by belief in Jesus and also by our good works (Roman Catholics and Lordship Salvationists).
It is also not eternally saving faith to reject Jesus’ death for our sins, or His resurrection from the dead.