RWC,
Your Disneyland analogy breaks down because there are literally hundreds of thousands of families who have had the same experience, largely because those experiences were so common. Mark's story about Jesus sleeping and being scolded by the captain of the storm-threatened boat, and then the seas being calmed, and then the men fearing Jesus is virtually unique.
In only one other place in literature or folklore do we find the same elements all appearing in the same story. Thus, it is extremely unlikely that it is just a coincidence that the five elements, which make the Jonah story unique, are also found in Mark's story. Now, you'll note that I said "extremely unlikely"; these words leave room for the possibility that perhaps by some miracle the correspondences are coincidental. It is in the slim "possibility" that true believes will take refuge.
However, if there is other evidence of extraordinary correspondences between Mark's Jesus stories and stories from Scripture, then I think objective observers would have to agree that those stories are just remakes of scriptural stories with Jesus as the hero, and that Mark's stories are just fictional. And, as you know, there are[i/] other stories in Mark, which show extraordinary sharp parallels to ones in Scripture.
For example, there's the story of Jesus' disciples complaining that they cannot feed so many men on so little bread, but Jesus asks them to do it anyway, and they miraculously succeed, with bread left over. This story seems to be the mirror of the one in the Old Testament where Elisha's disciples complain that they cannot possibly feed so many men on so little bread, but Elisha tells them to do it anyway, and they miraculously succeed, with bread left over. It is extraordinarily unlikely that Mark did not base his feeding story on the one in Scripture. Together, these two striking correspondences--the sea-calming, and the feedings, make it even more unlikely that Mark's stories about Jesus were true.
Then there is the agonized prayer by Jesus at Gethsemane which is the mirror of David's lament, and the betrayal by Jesus which is the mirror of the one of David by his counselor; the list goes on and on. If a true believer [i]needs
to believe that Mark's Jesus stories are correct, then he can take solace in the fact that one will never be able to prove conclusively the stories are fake; all that the skeptic will be able to do is show to those who are objectively-minded that Mark's stories were almost certainly copied from Scripture and are entirely fictional.
Articles which describe further the parallels I mention above are found in the "Mark's Gospel" section of the web page in the signature line below.
Joseph F. Alward
"Skeptical Views of Christianity and the Bible"
* http://members.aol.com/jalw/joseph_alward.html