Todays western liberal atheism is a "posion" because it is an worldview that gives you and the group evolutionary disadvantages. Thus western liberal atheism societies will cease to exist and become replaced with societies with an evolutionary functional worldview. A evolutionary functional worldview does not have to be organised supernatural religion as "christian" or "muslim" it must however contain a set of values which makes the members live a evolutionary successfull life.
The OP and title of this thread does not make sense. Atheism is just one of many world views (most rational, and most compatible with science). Any world view that is compatible with scientific revolution is also the most beneficial to societies.
Religion is an ancient relic that will eventually be abandoned as such.
Science does say how the world works and it does give you mental tools to solve particular problems but it does however not give you any values or instruction how to live your life whatsoever. For science it does not matter if you live or if you die or if you have a wife and family or if you become a drug addict. A successfull society must have someting more than science to guide its members in life.