Yes, there has long been a rift among followers of Chabad Judaism (a small but highly-visible sect of Judaism). Some believe that the last rebbe (leader of the sect) did not really die, but is continuing his sacred messianic work on another plane of existence. Others believe that he was not the messiah, but was merely his generation’s “candidate” for messiah, but the world was not ready. They believe that there is a possible messiah in every generation, and when the world is ready he will be revealed. The two groups refuse to discuss this rift for fear that it will tarnish his legacy.
In reality, he was just a very nice man with an incredible gift for marketing.