For me [Patriarchs] exist. Abraham, Isaac and Jacob exist today. They are people that you see with white beards. I have no doubt of their existence.
I think so. 9/11 has been a turning point in American history, there's no doubt about that.
I personally have no doubt that the Exodus occurred. How it occurred, I don't know.
That [Exodus] occurred, I have no doubt.
What of the Exodus? That too, is a wonderful story, but from the viewpoint of an historian, it is - to use a word scholars love - problematic. Let's say there are doubts, to say the least, among many scholars, as to whether the Exodus actually occurred. That's a historical issue.