According to Merriam Webster the definition of AGNOSTIC is very simple:
Main Entry: 1ag·nos·tic
Pronunciation: \ag-ˈnäs-tik, əg-\
Function: noun
Etymology: Greek agnōstos unknown, unknowable, from a- + gnōstos known, from gignōskein to know — more at know
Date: 1869
1 : a person who holds the view that any ultimate reality (as God) 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
2 : a person unwilling to commit to an opinion about something <political agnostics>
Now, to use this in a sentence:
Girl du jour is AGNOSTIC. I’ll believe it when I see it.
girldujour.com 
“I’ll believe it when I see it.” Yeah. Me too… with a lot of things.
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