Professor Tom Arnold...
Lord Lyndhurst...
Sir Lionel Luckhoo...
And yet, it's still not an accepted historical fact. Historians agree that Jesus very likely did exist, and very likely was crucified. They may even agree that Jesus's followers believed that he was resurrected. But that doesn't mean he actually was resurrected, and there is no historical consensus that he was. If there was such a consensus, you'd be reading about the Resurrection in secular history textbooks.
> If you're starting with an a priori conclusion...
I'm not, as I have demonstrated.
> How is that the supernatural "by definition" cannot exist?
Supernatural = outside of nature. Can you give me a coherent explanation of how something can exist outside of nature?