In On The Historicity of Jesus, Richard Carrier differentiated between the historical evidence for a claim, say "Jesus lived," and the prior probability that such a claim would be true. One rightly does this with all claims. If you say, "I flew to Los Angeles last week," and if I perceive you as a generally honest person, not suffering from dementia, and have nothing particular to gain (say, an alibi in a murder trial), I won't ask to see your ticket stub. But if you say, "I flew to Mars last week," I'll just chuckle and wait for the punchline. In both cases the evidence is the same -- your word for what you yourself allegedly experienced in the recent past -- but while lots of people fly to Los Angeles (for some reason), Mars is a long ways off, and I doubt anyone has made the journey yet. (And given present technology, it would be more than a week if they had.) So aside from historical evidence per se, we also need to consider prior probability for any claimed event.
So far, so good.
