Atheist – a person who disbelieves or lacks belief in the existence of God or gods.
Agnostic – a person who believes that nothing is known or can be known of the existence or nature of God or of anything beyond material phenomena; a person who claims neither faith nor disbelief in God.
Skeptic – a person inclined to question or doubt accepted opinions. One who questions the validity or authenticity of something purporting to be factual.
