A weak understanding of what the Bible says about sin is tied to a weak understanding of what the Bible says is achieved by the cross.
Some have argued that the Christian notion of Scripture is not epistemologically sustainable. It's not philosophically possible with rigor to uphold the Christian understanding of Scripture.
A wrong understanding is interested in precisionism. That is it tries to say that the Bible can't be telling the truth if it says that Jesus was such and such a distance from some place or other and in fact the distance is off by 15% or something like that. There are all kinds of grounded figures and so forth.
