Nds1,
He didn’t and can’t. The first consideration is to understand that Jesus is a mythical character only and has no historical authenticity. Outside of Christian literature there is no independent historical evidence that he ever existed. All the gospels were written decades after he was alleged to have died and cannot represent eye-witness testimony. The only near credible record was by the famous historian Josephus who lived in those times and who allegedly made an indirect remark in one of his journals. These references of course didn’t appear until some 300 years later when the church was trying to exert itself and needed some proof. The single offending paragraph in Josephus’s record was later found to have been forged.
The next major problem is with the Adam and Eve story and their apparent fall from grace that condemned all of us and led to the Jesus story and the need to be saved. The justification for Jesus coming to save us rests entirely on the literal truth of the A&E story as told in the bible. And it is here we have a fundamental paradox.
A&E are commanded not to eat from the tree that gives the knowledge of good and evil. It must therefore be assumed that because they have not eaten from the tree that they do not possess any knowledge of good and evil. They eat from the tree anyway and are condemned for it and so are all of us. The paradox is how were they expected to know it was a bad thing to eat from the tree and disobey God if they hadn’t eaten from the tree that would have provided them the ability to tell the difference between right and wrong? In essence they were tricked and the whole story of the fall from grace is a farce which consequently makes the need for a savior a farce together with the whole of Christianity that rests on this need for salvation.
The next major issue is where this idea of salvation came from. And no it is not original to Christianity. The mythmakers who wrote the gospels borrowed all those stories from many earlier myths, such as – well try this link as a starter. There are others if you need more.
http://home.earthlink.net/~pgwhacker/ChristianOrigins/
So in the end there is no salvation, there was no Jesus, and the entirety of Christianity is a rehash of older mythologies.