Pick out the most effective word from the given words to fill in the blanks to make the sentence meaningfully complete. ________ is the theory that one can neither prove nor disprove the existence of God.
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Break down the Greek roots to easily remember these philosophical terms:
* Theos = God $\rightarrow$ Theism (Belief in God)
* A- (Without) + Theos = Atheism (Belief that there is no God)
* A- (Without) + Gnosis (Knowledge) = Agnosticism (Belief that we cannot know for certain)