> Ok, so rationally we shouldn't claim that Jesus performed any miracles.
No, that's not rational, it's negative bias. There is evidence in the Gospels that he performed miracles; miracles are consistent with the kind of person Jesus was, and Josephus confirms that he performed miracles. So rationally we should claim he did perform miracles, since also science can't say whether miracles are possible or not. (Science can only deal with matters within its sphere, like the observation of repeatable natural phenomena.)
> We should not accept any claims other than that Jesus existed and had a brother.
You haven't read what I said. Again (this time with more cowbell): "What we do have is the existence of a Galilean Jew named Jesus who was born between 7 and 4 BC and died between AD 26-36. We have that he lived in Galilee and Judea, did not preach or study elsewhere, was called Christos in Greek, had a brother named James, and that he spoke Aramaic and may have also spoken Hebrew and possibly Greek. It is believed even from non-Christian sources that he had both Jewish and Gentile followers, and that Jewish leaders held unfavorable opinions of him. There are two events (and only two) whose historicity is subject to 'almost universal assent': that he was baptized by John the Baptist and shortly afterwards was crucified by the order of the Roman Prefect, Pontius Pilate."
> Any claims about miracles should not be accepted.
On the contrary, they should be accepted. There's nothing in science that says miracles are impossible. There's nothing in history that says miracles are impossible. If God truly exists, then miracles are certainly possible. The only reason to assert that "any claims about miracles should not be accepted" is if you have an a priori negative bias that forbids you from considering the possibility.
> I can't shown absolute certainty that the pterodactyl has gone extinct, but I have evidence enough to make me confident that the claim is likely true. In other words, I assess that the evidence is sufficient to justify a high degree of confidence even if I can't claim complete certainty.
There we go. Now we're talking. This is the same reasoning by which I assess that the Bible is true. Thank you.