"If people are good only because they fear punishment, and hope for reward, then we are a sorry lot indeed." Albert Einstein.
Atheists don't believe in gods, so they do good because they want to and not because they have to like most religious people. Obviously not all. People are people, some do good, some do bad. Atheist dont justify their good deeds or bad deeds by invoking a god or religion and morality is not from religion.