How is religion a source of morality?

This topic can not easily be answered in a short statement. Many people have spent their whole lives answering this question. However, morality is often defined as a system of moral conduct put forth by a society. A society's religion often defines its system of moral conduct. So, your question is a little bit like asking, "what are the similarities between a car and its wheels?" The fun starts when one considers issues like: Religion is not the only definer of morality. What happens when one system of morality comes into contact with another? How do we know which system of morality is correct?