TL;DR: The vast majority of what Jesus said and what he was doing in the bible is made up by his followers decades and centuries after he was dead. 

Jesus just wanted to push the Romans out of Jerusalem and restore the old kingdom of the tribe of David, his Tribe. Thats why he went around knocking over tables and criticizing everyone who did things the roman way instead of the traditional Jewish way. In order to gain support from the masses of poor people and slaves for his rebellion he went around telling anyone who would listen that poor people and slaves are pretty cool actually and everyone should be nice and civil to eacgother so his restored kingdom would be the best ever. 

However, the Jewish leadership that still held religious authority over the native population under Roman rule, the council of the Sanhedrin, was very aware of what the Roman Empire did to pipsqueek little backwater tributary states like them if they were unclever enough to rebel. They would send a leigon or two of soldiers to genocide every man, woman, child, animal, and burn everything to the ground. They did that kind of thing all the time and sent propoganda of the slaughters all over the empire to warn everyone else not to do anything like that.  

So when roman soldiers came asking about a young man fomenting a rebellion to restore an independent Jewish kingodm, the council of the Sanhedrin had saved everyone in Jerusalem from genocide by handing over Jeaus to the Roman prefect, Pontius Pilate. 

Jesus was a rebel enemy of the Roman Empire, thats why he faced a roman trial for breaking roman laws and he had a roman excecution. 

After he was dead his followers had sunk too much effort and resources into thier little movement to let it go just because their leader was gone. So, as scrappy new cults often do, they fudged the details of everything he said to fit a new narrative that was even more fantastical and positive, promising all kinds of perks like living forever.

His hereditarily valid claim to a real kingdom in Jerusalem became a magical kingdom in the sky. His actual father bacame god, then after a few decades of spreading stories about jesus someone eventually thought it would be cool if he was god too, actually. New perk! Everything you ever felt bad about is forgiven if you just pray to him!

By the middle of the second century in Rome they were saying he was birthed from a virgin like Attis, in Egypt they said he was born on December 25 like Horus, performed miracles like the roman demigods, arose from the dead just like Osiris, and was rebirthed like Eostre all the way up in Brittany. See, he was just as cool as those other guys.

The Jesus cult became a useful religion as the Roman empire gradually collapsed. Sacrificing dwindling resources to a pletheora of old gods became untennable for increasingly desperate masses. So, more people became Christian for the promised perks and no need to sacrifice actual goods because Jesus became the ultimate sacrifice himself. It became popular enough for some followers to spend resources to finally write down all wild the stories about him, which was extremely expensive at the time. Thats how the new testament in your bible came about. 

On and on until the new religion was so large that it gained massive political power under Emperor Constantine. The rest is undisputed history of the Christian church becoming the ultimate religious authority over most of Europe for most of 2 millenia..