Can anyone keep the law of God perfectly? Since the fall, no human has been able to keep the law of God perfectly.

Did God create us unable to keep his law? No, but because of the disobedience of Adam and Eve we are all born in sin and guilt, unable to keep God's law.

Since no one can keep the law, what is its purpose? That we may know the holy nature of God, and the sinful nature of our hearts; and thus our need for a Savior.