I know many of you want to use the common definition of "atheist" being someone who has faith there is no God, but that isn't a very useful definition since hardly any of those people exist. An "atheist" is simply a non-theist. If you don't have an active belief in a god or gods, you are an atheist. So really "atheist" should be an umbrella term including agnostics, ignostics, and various other flavors of non-belief. Google Alerts sent me this little article which explains it well.
Heck, maybe there is something we would be justified calling "god", but if such an entity exists I would guess it's completely unlike anything our world's religions or philosophers have ever made up. So you can call me either a "weak atheist", or an "agnostic atheist", or an "ignostic". The first two because I haven't seen any good evidence for any entities deserving the label "god", and the last one because I really don't have a good idea what "god" is supposed to mean anyway. Can you define it clearly?