What are you if you have no belief?

There is no technical name for it. If you do not believe in any God, plural or otherwise, you are an Atheist, but if you have no belief either way I don't know of a term for you.

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Some people prefer to be called Agnostic, though it seems the term is more commonly associated with people who question the belief of various theistic denominations rather than those who choose to simply not subscribe to a religion.