You must know that the bible isn't evidence for the truth of whatever is written within its pages?
Oxford definition of truth: a fact or belief that is accepted as true.
I don't understand why atheists, at least possessing some capacity for logical thought, can say this so confidently as if it means anything. Ideology, I suppose, is the reason. The atheists take the ideology of the theists and reflect it like a fractured mirror.
The Bible is evidence for and against the truth of whatever is written within its pages. If it were in a court of law, it would be utilized as both.
If I say Gandalf is the Headmaster at Hogwarts and Dumbledore is a wizard of the white order (formerly grey) who rides a white steed named Shadowfax the primary evidence is what source? That statement, regarding Gandalf and Dumbledore, is evidence of the facts regarding the fictional characters. It is also inaccurate and therefore untrue. This can be established through whatever is written in the pages of their respective sources. Lord of the Rings and Harry Potter books.
The Bible is evidence for what it says. It is also a collection of books by over 40 different authors over a very long period of time. Like a science text. The Bible is far more harmonious throughout than a much shorter period of science texts would be, but that's another story. The point is that you can use the Bible as evidence for the truth of whatever is written within its pages far more reliably than you could a science text, so the argument you're making is not only myopic but also moot.
Myopic and moot! That's atheism.