Because nothing is perfect. And society is not perfect. One of society's main causes is the harmonic co-existence of people, through education and societal forms (family etc etc - excuse my terminology, I dont which words are more suitable).
But as it is expectable in my opinion those forms are not perfect themselves, thus not all people are raised morally and/or the forms in which they were raised failed to make sure of that. This is where the law comes as a last "defense", not so much to educate, but to protect the rest from the "immorals" who had the bad luck in not being raised morally.
Also the law is a more "final"/strict guideline, because it has to ensure peace among thousands of people.
We do not need God for morals, because basically every moral guideline proposed by a religion may be depicted as if it is dictated by a god, but essentially its also common sense thinking in most cases. Now to the question that arises ("if it is common sense then why do people commit crimes") : Criminals do know that what they do is wrong thus it is obvious that they act on impulsive thinking and emotions and not logic.
PS: In my opinion
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