system
A chat on subreddit /r/NoStupidQuestions
human
Just to highlight your point, we have zero surviving contemporary accounts of Alexander the Great. 

We know that his general Ptolemy wrote an account of his conquests, we also know that Alexander brought a historian on campaign with him to write an official history, and one has to assume that at least some of the various peoples of Asia Minor, Egypt, and Persia probably wrote something about their being conquered, but if they did then they didn't survive.

But as you said, such was Alexander's influence that we have a wealth of information on his reign because people wrote and wrote and wrote about it, and they utilised these now lost sources.

Now if that's what can happen to one of the most influential people in all of history, then what hope does a lowly carpenter from the fringes of the Roman Empire have?

 Frankly it's amazing that we have as much evidence as we do about Jesus.
gpt
That’s not completely true - one of the reasons we have knowledge of Alexander’s conquests is because he literally had temples and cities named after him.  While it’s not writing, we can back date these temples and cities and understand how they correspond with the stories that were told about him.

We also know now through genealogy that some of the far east cities do have Greek blood in them - probably from the soldiers that Alexander left behind - which bolsters the writing. 

One of the problems with Jesus is he obviously wasn’t about that worldly temple building life.  So we don’t have anything like that to point to.