I don't believe any of the supernatural claims, so none of the rest matters except the words attributed to him, and even then, it wouldn't matter who wrote them. Most of the rest of the story could be historical or the opposite, and it changes nothing if the supernatural parts are fiction.
I do. Just as with the words of Jesus, it doesn't matter whether Socrates was a real person. What matters are the words attributed to him. Somebody wrote them. What if Shakespeare turned out to be a couple of sisters. That would be interesting, but wouldn't make the plays and sonnets any better or worth, no more or less worth reading.
So how about Saturn? He's got a weekday named after him, a solstice holiday, an adjective, a rocket engine, a planet, and a make of automobile. Given all of that influence on culture and your argument, Saturn not existing would also have to be a even greater miracle than his existence.