Obviously as an atheist, I'm not concerned with claims of performing miracles and preaching of the end times. I reject those claims on the basis of a lack of evidence. I assume you agree with that, so it isn't really even worth discussing. However, I am concerned with his moral philosophy and that doesn't require physical evidence. Because whether or not it's true that he lived that way or even existed has no impact on the actual philosophy itself. I am most concerned with how the character of Jesus as portrayed in the Bible lived.
What makes him particularly admirable is that he associated with criminals, the destitute, and the hated at a time when doing so was enough to get you stoned to death. He preached a message of love and mercy. Many of the other figures you mentioned also had wonderful ideas. Most did not actually live them in practice.
Could explain who were the people I mentioned that did not actually live as they practiced?
As far as I am concerned, I read the philosophy from ancient sources and look at life examples from modern sources. Because life histories of ancients are quite unreliable (and often glorified or sanctified) I find it better to look at more modern examples (like Gandhi or Mandela say) .
If you are talking about both great philosophy and great exemplar, why not look at the works of Epictetus? A Roman slave crippled by his master who later became a great Stoic practitioner of his time (50-110 CE)?
Epictetus | Internet Encyclopedia of Philosophy
Please read the brief summary in the link about his moral philosophy and tell me if his thoughts on ethics, good and evil are thought provoking enough to read and reflect upon. And who better to tell us of these things from the Roman world than one who was once a slave and became a teacher respected even by the emperors? So my question is:- Why is Epictetus not discussed and read as widely (and indeed more widely) than Jesus and Paul by non-Christians in Europe and USA?
As long as your sense of what is important and what is not important from your cultural heritage remains tied to what Christians believe to be worth reading , your views and your values will be parasitic on Christianity and will not have the autonomous substance to contribute positively and creatively in society. 2 billion people read that one book every day, read something else for once.