When does biblical history begin ?

[Godscreated]

Okay here's my question,

These days there are many Christians who will support evolution and a very old earth 4.5 billions years old, with a universe that's along the lines of 14 billion years.

Somewhere in this period they throw humanity into the mix some believe Adam and Eve could still have existed, or be created especially during the time that humans were also evolving, others believe that Adam and Eve were just a story of man's fall from grace. Given that most biblical characters can be dated back by linage to Adam and Eve's children that gives us a period of around 6,000~7,000 years since those people existed.  When does what the bible says become real history ?

Where does it place original sin in this context ?

We, Christians are not certain when creation took place. We do understand through the scriptures it was some short time before the fall. The fall as far as we can determine happened some 6000 years ago because we can trace most of the linage back to Adam and Eve. what do you mean by original sin, I'm curious no atheist I've spoken with has ever said, can you put a name to it, the Bible does.

GC