There is a common misconception among the theists of this world that atheists must lack morality. This misconception is based on their false assumption that morality comes from their religion, Though this is obviously nonsense, unless we are to assume that 2000 years ago it was ok to steal, kill and rape. The Romans had civilisation and laws long before christianity and islam reared their ugly heads on this unfortunate planet.
A passing glance at the bible it's self shows us that morality can not be based in religious scripture, Unless you think selling your daughter into slavery is ok and owning slaves is ok. Two things which are the opposite of moral.
So where do atheists get their morality from? The answer is simple. We get it from the same place the religious do. Morality is just another way of describing behaviour that is conducive with a productive and cohesive society. Humans are social animals and we have been for some time. And like other social animals it is seen as unproductive to cause unnecessary unrest. When asked "if you don't believe in god what is stopping you from killing someone?" i always answer "why would i want to kill someone?". We don't do things based on what is stopping us. We do things based on it being either productive or enjoyable. Just like honey bees can congregate in a hive numbering into the millions. So why don't they kill each other? because then there would be no honey. And if the honey bee had the neuron capacity to philosophise or ponder they would no doubt question why they have this need, This hardwired behavioral trait, That makes them unlikely to kill randomly for no reason.
Morality is also an ever-shifting zeitgeist. What is seen as immoral today wasn't immoral 1000 years ago, And in the future what we are doing now may be considered immoral, Things like burning fossil fuel for example. If morality is divinely given it wouldn't change based on societies perception of what is acceptable. If god gave us morality then what is wrong now would always have been wrong and what will be wrong in the future will be wrong now. We only have to go back to 1928 in England, To a time when women were not granted the vote, To see how far the moral zeitgeist can shift in such a short amount of time. If morality is from god it would not shift according to social perceptions.