agnosticism -
a religious orientation of doubt; a denial of ultimate knowledge of the existence of God; "agnosticism holds that you can neither prove nor disprove God's existence"
Agnosticism is the view that the truth value of certain claims—especially claims about the existence or non-existence of any deity, but also other religious and metaphysical claims—is unknown or unknowable. Agnosticism can be defined in various ways, and is sometimes used to indicate doubt or a skeptical approach to questions. In some senses, agnosticism is a stance about the similarities or differences between belief and knowledge, rather than about any specific claim or belief.
OmegaWiki Dictionary
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agnosticism The view that the existence of any god is unknown at present.