Ignore everything you think you know about this real or fictitious person and start over.
Once upon a time there were a people who took the idea of “living right” seriously enough to write down the rules, back when that kind of thing was rare. There was no separation of church and state back then, and certainly not here, where the book of rules was said to be the Law of God. This set of rules, the Law, had everything in it from “thou shalt not kill” to instructions on when and how to wash and what and how to prepare and eat your food. And because they took this all so seriously, you would be esteemed as a person, and respected, if you were viewed as living in accordance with the Law, whereas you would be pretty much cast out and snubbed and left out of things if you were viewed as one who reviled the Law.
Well, this had been going on for quite a long time, and these people had been enslaved or taken over at various points in their history, but had remained intact and kept their Law and survived all that, and now, once again, were conquered people living under the control of the empire of Rome. The Law, in addition to all those rules and directions, was a collection of stories of the people, and it was full of stories of leaders who had once led the people to freedom from those who enslaved them (a guy name Moses, in particular), so despite being conquered by Rome, the people had a certain spirit of “been there, done that, ain’t gonna last” and there was, along with the sense of rebellion-in-waiting, an anticipation of a great new leader who would do the Moses thing again and get Rome off their backs.
Meanwhile, going back to the business of social status and esteem and how people viewed each other as good with God or not so good with God, there was quite a bit of friction between different groups and factions concerning things like the propriety of profiting from the Roman occupation or how much you should give to the poor in order to earn the esteem of others. And, as in our day, there were plenty of your basic rigid fundamentalists doing some finger-pointing and, in the process, holding themselves up as counter-examples who were not doing these unLawful things.
So this Jesus fellow comes along and it turns out that he knows the Law well enough to use it against the fundies of his time, and he says that although the letter of the law is important and must abide, people should mainly concern themselves with the underlying spirit of what the Law actually says, its real message: forgive people if they do you wrong, share what you’ve got, love your neighbor; forgive them and forgive them again, not expecting or demanding compensation of some sort for forgiving; share without keeping track of what you’ve shared and forget about getting any of it back; love not only your loving neighbor, but even your hateful neighbor who isn’t loving you back. And don’t be doing these nice things in front of an audience to impress folks with how Lawful and righteous you are, and don’t go around pointing fingers at people and telling them they are doing it wrong.
So his other main message (the first main one being the bit about love and forgive and share) was therefore that Goodness, although it can be described and codified in a good Law, is always more important than and primary to the Law itself.
And he went around accepting misfits that were normally despised, thus violating the unspoken social codes about how to treat the unLawful who weren’t Doing It Right, and made many of them feel like actual people for the first time in years and years. He also visited sick folks, who were normally shunned (the Law advised quarantine, logically), and tried to help them, and soon all kinds of stories sprung up about how this Jesus guy could change your life.
So this was cool and groovy and attracted lots of flower children who could grok to this pretty good, and even moldy old finger-pointers – not so much the fundies as the ones who tended to point at the whole society and tell everyone how unGodly the whole culture had become – listened and got it and started following him.
But the fundies and the ones who liked to parade their Lawful Goodness ostentatiously as one of the Almight In Crowd, naturally enough, found this appalling and kept challenging him, trying to get him into trouble. He was hassled about visiting sick folks and pariahs on the Sabbath, but he defended himself, quoting the Law back at them; they tried to turn some of his flower-child words back against him–they accused him of committing blasphemy and declaring himself a God–but he cited a passage in the Law that said we are all Sons of the Most High (but don’t live up to it and fall short of our natures).
Meanwhile, the Romans, who had enough awareness of the old stories of Moses and the rebellion-in-waiting spirit of the people to be wary of anyone who attracted a following, didn’t like the way people were clustering around this Jesus guy, and it didn’t help that many of them were saying he was going to lead them out of bondage as they’d been expecting someone would. When Jesus ran some loan sharks out of the temple, it attracted a lot of attention. So when the fundies decided to do something about Jesus, they went with the idea of turning him in to the Romans as an insurrectionist, and the Romans found it convenient to be able to intervene at the request of some officials of these people themselves rather than of their own accord.
So they locked him up, tried him for being a troublemaker, and killed him.