When you say 'unevidenced', to what is it you are referring?
Uh ... to the fact that there is no evidence that everything in the Bible is completely true.
It seems you believe science to be discriminatory in regards what counts as 'evidence'.
No.
If you don't believe it discriminatory, then in what way is the the 'assumption that the Bible is completely true' unevidenced?
In the sense that it is unevidenced.
I don't know how to make this concept any simpler for you.