No you don't.
The idea that these "eyewitness accounts" are in any way verified is laughable - especially considering how heavily manipulated the texts have been over such a long time and through so many widely different historical contexts.
Imagine if these claims were to be tested in a court of law. It would never make it to court in the first place because the claims would be too outrageous to file in the first place.
What is laughable is someone saying something is not true but can't prove it, or saying something is true and can't prove it.