belief in the existence of a god or gods; specifically : belief in the existence of one God viewed as the creative source of the human race and the world who transcends yet is immanent in the world
Atheism:
a : a disbelief in the existence of deity b : the doctrine that there is no deity
Agnosticism:
Doctrine that one cannot know the existence of anything beyond the phenomena of experience. It is popularly equated with religious skepticism, and especially with the rejection of traditional Christian beliefs under the impact of modern scientific thought
Gnosticism:
the thought and practice especially of various cults of late pre-Christian and early Christian centuries distinguished by the conviction that matter is evil and that emancipation comes through gnosis
Gnosis:
esoteric knowledge of spiritual truth held by the ancient Gnostics to be essential to salvation