Yes, we even have the body of a crucified person. One out of how many? On the day of Jesus' Crucifixion we are told, with what degree of veracity we don't know, that four people were due to be put to death. Jesus, the thieves and Barabbas, who was allegedly reprieved. These executions were performed on a mass scale. What evidence is left to us?
We know how many legions there were, and how often soldiers were paid, so we know that millions of pay advice notices were prepared. Three examples survive, I have read, out of these millions generated over the centuries. We have the scanty debris of a vanished civilisation, that's all.
1. The problem is that a Jesus whose only defining characteristic is that he got crucified, is not much of a historical Jesus. Because it's so generic, that by sheer probabilities alone, there'd be hundreds of other crucified Jesuseseseses. It's like identifying what novel I have in mind (War And Peace) by just saying "it's about Russia."
You have to narrow it down a bit for it to actually have any value.
2. And there start the problems.
For a start, which of the half a dozen or so cherrypickable Jesuseseseses is yours? What evidence do you have that it's your cherrypicking and not that of some other (and probably more reputable) scholar.
Second, most cherrypickable stuff would make him actually noteworthy. Sure, they didn't record everyone who was nailed, but for example Josephus made a point of mentioning (A) messiah claimants, because he was making the point that those were false, Vespasian was the real thing, (B) anyone speaking against Jerusalem or the Temple, for the same reason, down to mentioning a random peasant who did so, (C) conflicts with the Roman governors, because of the point he's making that the Jews were just another people, and weren't creating friction with the governors just because of being unreasonable religious nutcases on the whole, etc. A guy actually creating a major scene in the Temple? How'd he never hear about that one?
And that's not even counting other ancient authors who should have been very interested. Philo of Alexandria for example is THE guy who wrote the theology of John, namely the whole Logos thing being a second deity and firstborn of God. And around Passover he might even have been right there on site in Jerusalem. Don't you think he'd be VERY interested if someone claimed to BE his Logos, like Jesus does in John? Hell, even if the sect of some recent dead guy claimed that posthumously about their guru, don't you think he'd be interested?
E.g., the claim to be THE son of man, when that's in both Hebrew and Aramaic just a kenning for "man", and only exists as a special title in a foreign language and in apocrypha... don't you think SOMEONE would be interested in that kind of radically different theology?
3. Even the crucifixion as described in the Bible takes a massive leap of faith to take at face value.
It's a highly irregular proceeding that
- doesn't fit Jewish law,
- breaks Roman law in the process too (more than once: giving a body to a stranger was also a capital offense),
- doesn't fit the historical character of Pilate,
- doesn't fit the historical character of Caiaphas,
- is in the wrong place (turning Jesus unwittingly into a tropaeum, a symbol of VICTORY, by making it on the hill),
- breaks the law again by making an innocent carry the cross in a crucifixion procession,
- is for an offense that would have him killed or arrested on the spot instead of the next day, yet somehow Pilate finds nothing punishable about it
- has just one convict be given a different coup de grace than the standard Roman coup de grace, for no obvious reason, and nobody even asks why
etc.
And that's not including other details that require a leap of faith, such as that Jesus debates priests in the Temple and whatnot, but the next day they need to bribe Judas to identify the guy. Or that one of Jesus's followers actually commits assault with a deadly weapon, but I guess everyone forgives and forgets, because it is never mentioned ever again. Etc.
So did Mark know ANYTHING about that crucifixion? More importantly again, when someone writes a dozen things that are wrong about an event, why would you believe anything else about that event from him?