Genesis is not fact, there for Jesus is not necessary?

[Drich]

Please forgive me if this has been covered. I did search, but didn't find anything that seemed to address this directly.

I'm having trouble with what to me seems like a very simple concept.

In it's simplest possible terms:
Evolution is a Fact, we evolved as a species, not from a single human.
Therefor, Genesis in the Bible, in particular Adam can't be fact.
Without Adam, there is no Original Sin.
Without Original Sin, there is no need for Jesus Sacrifice.
Jesus Death is THE pillar of Christianity.
Christianity is unfounded, and therefor false.

What am I missing? Why is this seeming simple progression not a total refutation of Christianity?

Again.. if this has indeed been covered, I apologize, and ask for a quick link.

-Or you can say the doctrine of 'Orginal sin' is not identified in the bible.

Eitherway, the fact of the matter is you still have sinned, and owe a debt because of it.