Prologos can you refute the concept of sin in a philosophical way?
You're partially right about the Bible.
Bible purpose is to be theologically right about salvation of the soul. Secondly it intend to be historically correct too related to it's main goal.
Christians knew since Saint Augustine that Genesis cannot be read literally.
Sola Scriptura is wrong and cannot be defended. So atheism based on the refutation of Sola Scriptura is right in some way.