Agnosticism

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Agnosticism is not knowing whether or not a deity exists. Agnostics often believe that no one can be certain of the existence of a deity, and sometimes that it is impossible for anyone to ever be certain.

Agnosticism usually refers to those who are aware of theistic religions but have decided that they cannot be certain. As opposed to someone who is unaware of theistic religions and therefore cannot make such a decision.

It should be noted that agnostics may follow non-theistic religions such as Buddhism.

[edit] A dictionary definition

agnostic: a person who holds the view that any ultimate reality is unknown and probably unknowable; broadly : one who is not committed to believing in either the existence or the nonexistence of God or a god