2. Belonging to, characteristic of, or constituting another and very different place, society, or person; strange. See Synonyms at foreign. 3. Dissimilar, inconsistent, or opposed, as in nature: emotions alien to her temperament.
n, pl -thens or -then. 1. (Alternative Belief Systems) a person who does not acknowledge the God of Christianity, Judaism, or Islam; pagan. 2. an uncivilized or barbaric person. 3. (Alternative Belief Systems) the heathen (functioning as plural) heathens collectively.
A person who rejects the existence of any God is an Atheist. A person who is ignorant of the God of Abraham is a heathen. A person who worships other Gods is a pagan. A person who doesn't believe in god at all is called an athiest (a-without, theism-beliefs on god).