Some people claim that morality is dependent upon religion, that atheists cannot possibly be moral since god and morality are intertwined (well, in their minds). Unfortunately, this is one way that religious people dehumanise atheists who have a logical way of thinking about what constitutes moral social behaviour. More than simply being a (incorrect) definition in the Oxford dictionary, morality is actually the main subject of many philosophers' intellectual lives. This video, the first of a multi-part series, begins this discussion by defining morality and then moving on to look at six hypothetical cultures and their beliefs.

Here's the paper mentioned in this video:

Nicholas Epley, Benjamin A. Converse, Alexa Delbosc, George A. Monteleone, and John T. Cacioppo (2009). Believers' estimates of God's beliefs are more egocentric than estimates of other people's beliefs. PNAS doi:10.1073/pnas.0908374106