I agree that a Jewish rabbi might change some of his attitudes and fix what he might believe needed fixing about his religion ... but he wouldn't leave his religion. That makes no sense whatsoever.<quoted text>I doubt it.
The pope wouldn't leave his religion. As we can plainly see, he is trying to FIX his religion.
Martin Luther left his religion because he wanted the fame and glory of being the leader of a new religion, and to boot marry the ex-nun of his dreams.
Some things make sense, and some things don't. And "within the framework of theology," it makes no sense that Jesus would leave Judaism.