According to a programme I saw on the UK History channel, it was statistically probable that there were about four Jesus ben Josephs in Judea at the time of Christ's lifetime, and there is tentative evidence of at least one of them.

To the person who triumphantly demonstrated I was "wrong again" (I don't admit to EVER being wrong!) - I'm afraid he is overstating his case in this regard. While it is true that the existence of some things has been posited and eventually proved right, such as atoms, that does not mean every proposition will always be right. When atoms were discovered and studied, it was found that they were not at all what had originally been suggested, for example: an indivisible particle that was the same as every other other atom.

Nevertheless, let's accept that I'm splitting hairs over that. I still maintain that what I said was true: if there is absolutely no evidence that a thing exists, then, on the balance of probabilities, it doesn't. That's not to say it definitely doesn't, but if you need a working model, the one that assumes it doesn't exist will probably be right. The evidence of your eyes/ears/reason will be right more often than not.