They were true believers, but they were overwhelmed. This was terrifying to them.
Christ had to do this alone. Who could have helped him? Only the Son of God, only Christ, is qualified to suffer and die on our behalf and to bear the punishment of sin for all who would be redeemed in the history of the world, and sustain that eternal weight of punishment on their behalf. He must be perfect in order to do this. He must have no sin of his own. He must be divine. No one could have helped him and no one did. Some looked from afar but that is all. He was entirely alone in carrying out the work of redemption for us.