Not a dumb question at all, young friend (though you might not be much younger than me, being in high school...)
Anyways, Agnosticism is the belief that one cannot truly know that any god (with or without the capital G) does or does not exist. Basically, you live your life to the fullest, perhaps combining the beliefs of various religions to form your own philosophy, or just making up your own philosophy without regard to any religion at all.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)