If you know a person was truthful his whole life and of high moral character...

[Shell B]

But what if the claim is more then hearing the Angel, but actually seeing Angels. Wouldn't that only be a trait of schizophrenics provided he is truthful and it's not of divine origin.

Not at all. In fact, I would venture to say that is a sign that it is something other than schizophrenia. Schizophrenics most often suffer auditory hallucinations. Visual hallucinations do not typically take specific forms. They can be shadows moving and other menacing things, but the likelihood of a schizophrenic seeing a nice angel that didn't tell them to do horrible things or make fun of them would be rare indeed, in my opinion. Schizophrenics don't have pleasant la-di-da religious experiences that are associated with their illness.