One's belief, hearing and faith are not what saves them. Christ is the Saviour so He alone does the saving.Hogwash!
In John 8:43 Jesus was speaking to the lost Pharisees. They were a bunch of religious reprobates that were spiritually dead. Reprobates cannot hear spiritual things.
You refuse to acknowledge the fact that 8,000 Jews were saved on the day of Pentecost because they heard and believed Peters Gospel, Acts 2:41 also Acts 4:4.
"So then faith comes by hearing and hearing by the word of God" (which is the Gospel" Romans 10:17.
Everything else pertaining to salvation, comes to those saved from that.