Belief and Forgiveness

Mark 3:28-29 "Truly, I say to you, all sins will be forgiven the children of man, and whatever blasphemies they utter,
29 but whoever blasphemes against the Holy Spirit never has forgiveness, but is guilty of an eternal sin"
Mark 1:15  ... and (John) saying, "The time is fulfilled, and the kingdom of God is at hand; repent and believe in the gospel."
Mark 16:16 Whoever believes and is baptized will be saved, but whoever does not believe will be condemned.John 3:18 Whoever believes in him is not condemned, but whoever does not believe is condemned already, because he has not believed in the name of the only Son of God.
John 6:29 Jesus answered them, "This is the work of God, that you believe in him whom he has sent."

John 8:24 I told you that you would die in your sins, for unless you believe that I am he you will die in your sins."