Confucianism is an example of a system of social and ethical philosophy that conformed and conforms many people in China without the idea of a 'God'. It defines familial relationships, friendly relationships, political relationships and even international political relationships between nations --- all without the idea of a 'God'. Confucian principles are what the morals and laws of China are largely based on, similar to how many of our morals and laws are based on biblical ideas (*whether these ideas originated in the bible or not*).
This is a blaring illustration of the fact that 'God' is one specific idea that is not necessary for society to conform to a set of moral standards. In other words, atheism does not lack morals/order/conformity.
My point is not that we should all do what confucius said. I will continue to eat large chunks of bloody meat and not use chopsticks, thank you. I'm also not saying that christianity is obsolete in western society right now.
My main point is that society does not need a deity to worship in order to have morals, order and conformity. 'God' is, *ultimately*, an obsolete idea.
As a background, most Chinese distinuish between 3 types of religion: one for Confucianism, one for Taoism and one for Buddhism. Buddhism came *after* Confucianism, so Buddhism plays less of a role in Chinese society than Confucianism. Taoism is a philisophical religion that does not deal with death in any detail. Almost all Chinese are Confucianists, while many are Taoists and some are Buddhists.