To the OP, should he be reading, I’d just like to note that information about Jesus was specially conserved through to today. In many senses, he’s actually quite well attested.
I don’t know enough about Alexander the Great to comment about him, but if you compare Jesus to other figures who were in the same class of the time, John the Baptist, Simon Magus, Dositheos, Ebion, St James, Ananias, Judas, etc. we have far more information that we’re fairly accepting of (3-4 sentences worth) than we do of these other figures, way more information about Jesus which is plausibly true (paragraphs), and potentially that information only exists thanks to the Jesus connection. (The sections of the Ginza Rba that I have read make me think that it’s no earlier than a late 2nd century work. So I wouldn’t currently accept any biographical information about John the Baptist from it as being very worthwhile.)
One of those things about archaeology and textual history is that we don’t know the things we have no information about. We’re not even aware of the gap. If there was a giant warehouse in the middle of Jerusalem, that had collected every single piece of testimony on the visit of extra terrestrials to Earth, in 65 AD, and that building was destroyed and burned in 70 AD, we would have no inkling that ET had visited.
Take, for example, the Great Hedge of India. This is something that existed only 200 years ago, but was rarely discussed in print and few of those writings were preserved, just through random luck. We almost lost all record of it, and didn’t know that there was such a gap in our knowledge, until a single sentence that referred to it was found in 1995. (There ended up being more information about it available, but it was all in obscure, old works that may have all ended up one day being recycled for space, or who knows what.)
Overall if, say, the population of Judea around 30 AD was 1 million people (a random, plausible number), but all of the names of all of the people that we have from that time and place is a few hundred, then that’s not a particularly good set of records. Particularly not if, for most of the hundred, we have nothing more than a name and maybe a profession. And if we say that we really only care about the 1% most important people, then we’d be hoping for information on 10,000 people. And, as the most important 1%, we would probably expect to have more than just their name and profession. We certainly don’t have that.
We probably do have a few hundred people from the 1st Century, in Judea, where we can say both what their name is and what their profession was. Adding in gravestones, maybe we could get a number more names, but not much else. But that probably means that we’re missing 90-99% of the people most likely to be historically notable. And that’s just a complete blind spot. With that many people missing, significant changes to our view of what the world was like at that time, in that place, could be revealed. We’re limited to the not-necessarily-truthful views of a few individuals who wrote about a small, select subset of the group we want to know about, who are themselves just a small subset of the whole population at that time.
By that standard, the information we have on Jesus is extraordinary. The fact that we can debate extensively and track information from Christian sources to Roman to Mandaean to Arab, and find some amount of all of it slightly elucidating, is impressive. It could all be a lie, or an extreme distortion of something true, but the works that we have which are plausibly from the right time and place, about this one man, is actually quite expansive given what we would expect from the information we have on everyone else of the time.
Lives aren’t really at stake, when it comes to the historicity of Jesus. So the lack of similar animosity would make sense. At the end of the day, debates over the historicity of Jesus are liable to have about as much impact on the quality of life of humanity as debating whether your least favorite rugby team cheated in that game in '67.