B,
How are ya? 
I have read and re-read your post and I am still unsure of what you are trying to say.
Why would our legal system not be an intellectual moral system? Why do we have laws? Not to ensure we don't sin, or go to hell. We have laws to protect society. If humans did not have the intelligence to try and do what is right to live together in a healthy society then we would not have advanced this far. We as a society have made laws and have set up moral standards based on knowledge and experience. Most of us know better than to beat our children with a stick. We know this because we have learned that physical punishment of children can lead to adults with mental and abusive issues. It hurts them emotionally as well as physically. The bible did not teach us that.
Our laws do not reflect an "eye for an eye". In some countries it does, if you steal you get your hand cut off. In our society we would never do that. Why? Because that would be cruel, that is the emotional side to our moral system.
I may be way off base on what you were trying to say, but it seems like you are saying that without god or the bible we would not be moral. I hope I am wrong in that assessment.