Given how obvious it is to me that jesus/god don't exist, how come so many people think they do?
Fear of death is a motivating factor in the belief of a God. Since neither the existence nor nonexistence of God can be proven, it leaves the way for many to believe. One could make an argument for a historical Jesus. I've only know of Flavius Josephus that made mention of Jesus around that time period (outside the writings of Jesus disciples). Josephus' reference was a vague reference too.
However, keep in mind that Socrates never wrote anything and all our knowledge comes from his students Plato and Xenophon. Similarly Jesus supposedly never wrote anything and all his teachings came from his students. Who was the real Socrates or real Jesus? Who knows, they've both been dead for thousands of year.