And there, I disagree. The Bible obviously cannot be the basis of any moral system; but really knowing what is right and wrong is not sufficient. The Bible is useful in a sense because if you accept its precepts, and if you already have a basis for moral behavior, it can help you to actually follow said beliefs. It by itself is neither necessary nor sufficient but sometimes, when one is faced with a decision to either follow the beliefs they have or to ignore them, it can help them to follow them.
If you already have the conviction to be good, then I don't see how the Bible is different than, say, a list of movies or some good books. You can get moral tales from a number of places if you want to look for them (and you already have admitted you have to go looking through the Bible to get the good tales instead of the bad).
-Drachasor