How can we define "atheism"?  The term is a bit ambiguous.  Some atheists might say that they reject all possibility of a deity or deities.  However, the problem with this position is that the existence of deities is not scientifically falsifiable.  In other words, we can not disprove a god or gods any more than we can disprove fairies or the ubiquitous Flying Spaghetti Monster.  Therefor…