As has been stated many times before, atheism has no basis for morality. Morality in atheism comes down to a matter of opinion. However, just because someone is a theist doesn't mean they follow the commandments of Jesus. A person can believe in God and still do immoral things. What I'm talking about is the commandments of the New Testament vs secular morality.
The majority of people in society, whether they are theists or atheists, don't follow the teachings of Jesus and the apostles. It should not surprise us then that a lot of crime, evil, and injustice happens in our society. To think secular morality is a good thing is a delusion. If I follow the teachings of the New Testament, I am to love others, not steal, not lie, not commit adultery, not murder, not mistreat the poor, help the widows, and be forgiving. Secular morality cannot and doesn't offer such a basis. Let me give an example:
If an atheist was sent to prison and he had a choice of cells: he could either share a cell with a group of unrepentant rapists and murderers, or he could share a cell with a group of born again Christians who decided to repent and follow Jesus, I'm sure that most atheists would prefer to share a cell with the Christians. The atheist would know that unrepentant rapists and murderers have no basis for their morality. Or what about the prison guards? Would an atheist prefer to live in a prison where the prison guards were born again Christians who believed in caring for their inmates, or would atheists prefer to live in a prison where the guards did as they pleased? Some of the prison guards in American prisons are brutal. They have even tortured the inmates.
This is why the commandments of Jesus are way superior to the morals of secular morality. If atheists disagree then I want them to tell me: would they prefer to share a prison cell with unrepentant criminals, or with born again Christians?