A passive atheist is someone who doesn't have any belief in Gods via a default position. For instance, a baby is a passive atheist, since babies do not have the mental capacity (yet) to understand concepts of belief, let alone the whole idea of God.
An active atheist is someone who understands the concept, but forms an active disbelief of it. This could be in the form of a rejection, or a simple absence of persuasion in the direction of belief.
An active atheist is someone who understands the concept, but forms an active disbelief of it. This could be in the form of a rejection, or a simple absence of persuasion in the direction of belief.