a·the·ist
n.
One who disbelieves or denies the existence of God or gods.
ag·nos·tic
n.
1. One who believes that it is impossible to know whether there is a God.
2. One who is skeptical about the existence of God but does not profess true atheism.
3. One who is doubtful or noncommittal about something.
adj.
Relating to or being an agnostic.
Doubtful or noncommittal: “Though I am agnostic on what terms to use, I have no doubt that human infants come with an enormous ‘acquisitiveness’ for discovering patterns” (William H. Calvin).