"...no sign will be given it except the sign of Jonah. Just as Jonah became a sign to the Ninevites, so will the Son of Man be to this generation. At the judgment the queen of the south will rise with the men of the generation and she will condemn them, because she came from the ends of the earth to hear the wisdom of Solomon, and there is something greater than Solomon here. At the judgment, the men of Nineveh will arise with this generation and condemn it, because at the preaching of Jonah they repented, and there is something greater than Jonah here." (Luke 11)
I've never understood how "scholars" can doubt the story of Jonah when Jesus so clearly states what will happen on the Last Day regarding those who repented at the preaching of Jonah. Each of us likewise needs to turn to God and change the way we think and act, and belive the Good News, as the Spirit works on our hearts through the Word.