One of the biggest misunderstanding about this group is whether or not people holding no beliefs about the spiritual are considered atheists (ex. babies, undecided, agnostics). The answer is no. The reason atheists are trying to push this definition is because if they believe nothing, there is no need to back up their beliefs. You can't disprove something that doesn't exist, can you? Therefore, here is a revised definition:Atheist (n): One who holds a belief that there is no god or supreme power.
I encourage you to, if you are debating an atheist, make this point very clear. This will cause them to have to back up their claims with some actual proof of one side rather than obscure points.