That is a nice theory, but some of the events recorded in the gospels are evidence that He knew more than His culture.
Two instances come to mind.
- A healing of a blind man which required adjustments indicates a knowledge of anatomy not available in His culture.
- He knew that there are not husbands and wives in heaven.
Mark 8
22 They came to Bethsaida. Some people[d] brought a blind man to him and begged him to touch him. 23 He took the blind man by the hand and led him out of the village; and when he had put saliva on his eyes and laid his hands on him, he asked him, “Can you see anything?” 24 And the man[e] looked up and said, “I can see people, but they look like trees, walking.” 25 Then Jesus[f] laid his hands on his eyes again; and he looked intently and his sight was restored, and he saw everything clearly. 26 Then he sent him away to his home, saying, “Do not even go into the village.”[g]
Matthew 22
23 The same day some Sadducees came to him, saying there is no resurrection;[a] and they asked him a question, saying, 24 “Teacher, Moses said, ‘If a man dies childless, his brother shall marry the widow, and raise up children for his brother.’ 25 Now there were seven brothers among us; the first married, and died childless, leaving the widow to his brother. 26 The second did the same, so also the third, down to the seventh. 27 Last of all, the woman herself died. 28 In the resurrection, then, whose wife of the seven will she be? For all of them had married her.”
29 Jesus answered them, “You are wrong, because you know neither the scriptures nor the power of God. 30 For in the resurrection they neither marry nor are given in marriage, but are like angels[b] in heaven. 31 And as for the resurrection of the dead, have you not read what was said to you by God, 32 ‘I am the God of Abraham, the God of Isaac, and the God of Jacob’? He is God not of the dead, but of the living.” 33 And when the crowd heard it, they were astounded at his teaching.