Jesus of Nazareth, if he did live, would have been known by Jews and Pilate as an idiotic false prophet since about the 15th year of Tiberius c 29-30 CE.
I agree. But is that not how Jesus is presented as being received by Jews and Romans in the NT? Take these excerpts from Mark, for example.
Then Jesus went home, and once again a crowd gathered, so that he and his disciples could not even eat. When his family heard about this, they went out to take custody of him, saying, “He is out of his mind.”
And the scribes who had come down from Jerusalem were saying, “He is possessed by Beelzebul,” and, “By the prince of the demons he drives out demons.”
Jesus went on from there and came to his hometown, accompanied by his disciples. When the Sabbath came, he began to teach in the synagogue, and many who heard him were astonished. “Where did this man get these ideas?” they asked. “What is this wisdom he has been given? And how can he perform such miracles? Isn’t this the carpenter, the son of Mary and the brother of James, Joses,a Judas, and Simon? Aren’t his sisters here with us as well?” And they took offense at him.
Then Jesus said to them, “Only in his hometown, among his relatives, and in his own household is a prophet without honor.”
Then the Pharisees came and began to argue with Jesus, testing him by demanding from him a sign from heaven.
Jesus sighed deeply in his spirit and said, “Why does this generation demand a sign? Truly I tell you, no sign will be given to this generation.”
Then he began to teach them that the Son of Man must suffer many things and be rejected by the elders, chief priests, and scribes, and that he must be killed and after three days rise again. He spoke this message quite frankly, and Peter took him aside and began to rebuke him.
He told them, “The Son of Man will be delivered into the hands of men. They will kill him, and after three days he will rise.” But they did not understand this statement, and they were afraid to ask him about it.
At this, the high priest tore his clothes and declared, “Why do we need any more witnesses? You have heard the blasphemy. What is your verdict?”
And they all condemned him as deserving of death.
Then some of them began to spit on him. They blindfolded him, struck him with their fists, and said to him, “Prophesy!” And the officers received him with slaps in his face.
Then the soldiers led Jesus away into the palace (that is, the Praetorium) and called the whole company together. They dressed him in a purple robe, twisted together a crown of thorns, and set it on his head. And they began to salute him: “Hail, King of the Jews!”
They kept striking his head with a staff and spitting on him. And they knelt down and bowed before him. After they had mocked him, they removed the purple robe and put his own clothes back on him. Then they led him out to crucify him.
And those who passed by heaped abuse on him, shaking their heads and saying, “Aha! You who are going to destroy the temple and rebuild it in three days, come down from the cross and save yourself!”
In the same way, the chief priests and scribes mocked him among themselves, saying, “He saved others, but he cannot save himself! Let the Christ, the King of Israel, come down now from the cross, so that we may see and believe!” And even those who were crucified with him berated him.