“Mary could have stopped the crucifixion. Very simply, she could have stopped the torture and the agony of her son’s death on the cross. How? [Jesus] was crucified for one reason: He claimed that God was His Father.
If that were a lie, if Mary had been unchaste, she would have had to admit that she was immoral, but she could have stepped forward at any time and said, “Stop this horror! I’m ashamed! I confess! I will tell you who His real Father is!” She could have destroyed [Jesus’] whole pretensions and saved Him from the cross.
No mother, to save her own reputation, would allow her son to be horribly mutilated and killed. Mary could have and would have stopped her son’s horrible death, as any mother would have, except that she knew who His Father was.
She knew Jesus’ Father was God.”
Source: D. James Kennedy, Why I Believe (Thomas Nelson; Revised Edition, 1979)