Similar to Athiest or Agnostic, Nondiest (Non Deus = Latin for No God(s)) is someone who not only doesn't believe in God in the modern Christian, Jewish or Muslim sense, they also don't believe in any kind of diety in past history, such as Pagan (Greek or Roman) Gods Zeus, Hera, Poseidon, Athena, etc., plus, doesn't believe in anything religious, spiritual, mystical, mythical, supernatural or celestial, like:

Religious: like Buddhism, Hinduism, Pagan Gods like Zeus

Spiritual: angels, demons, spirits, ghosts or apparitions

Mystical: like karma, palm reading, ESP, telepathy or luck
Mythical: like the Loch Ness monster, Bigfoot, dragons or unicorns

Supernatural: like vampires, werewolves, etc

Celestial: like the Chinese Zodiac, astrology or even aliens