No. Man is imperfect as are animals. We by ourselves are incapable of knowing the difference between good & evil, only a perfect being could do that. People are born neutral (neither good nor evil), they as an infant cannot comprehend either of the two ideas. It is only when we learn that the actions we commit (such as theft) and other crimes are bad because we are taught by society (people around us) or we can learn that by knowing what it means to steal for you and the victim whom you've chosen to take away an object from. In countries in the Middle East centuries ago, you were killed or severely punished and looked down upon for stealing a horse for example. This could be a major problem for the victim because they for all you know could be a poor merchant who needed his horse to travel & do business, if his horse were to be stolen from him while he was by himself in the desert, he could die as a result of losing his horse to you. I might have made the mistake years ago of wishing death upon someone, that is an evil thought because there is absolutely no reason why you should want someone to lose their life, especially when they could become your best ally and help you later in life. So to fully answer your question, Atheism is the belief that there is no God, no perfection, no divinity which means no perfect law and that can make any action justifiable by mere popular opinion. I would much rather be forgiven for stealing or committing a misdeed than being put to death or go through some cruel punishment by a group of people who according to them and their opinion think I might deserve the worst death ever. To prove Objective Moral Values exist (like the existence of Good & Evil), you must first prove that God and a divine/perfect law exists (intolerant of opinion, otherwise known as fact) to really explain morality.