To be technical, there are 4 basic levels of belief.
Gnostic theist - I know there is a god/gods.
Agnostic theist - I believe there is a god/gods, but I can't be 100% sure.
Gnostic atheist- I know there are no gods.
Agnostic atheist - I don't believe there are gods, but I can't be 100% sure.
I am the last. One can be simply agnostic, if they aren't sure either way. There's also pantheists, deists, and others, but those are the main ones.
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