agnosticism, (from Greek agnōstos, “unknowable”), strictly speaking, the doctrine that humans cannot know of the existence of anything beyond the phenomena of their experience. The term has come to be equated in popular parlance with scepticism about religious questions in general and in particular with the rejection of traditional Christian beliefs under the impact of modern scientific thought. http://global.britannica.com/EBchecked/topic/9356/agnosticism