Atheism is a particular point of view, philosophy? Skepticism? well, it is defined largely by what is NOT believed. In a sense it is a negative statement, by how the word is formed.
However, this podcast asks if atheism is really simply the 'going away from religion", the English is given as ’ Is it simply the absence of religion? They discuss atheist ‘morals’ (ethics I think is a better term) also rituals for atheists(I haven’t listened to all of this yet, so I don’t know) and also humanistic institutions.