Let me make sure I'm hearing you right. You don't know the truth, but you also believe it is knowable. If that is the case, your not agnostic. Agnostic means you believe that the knowledge of something like "god" is literally unknowable.
And, when you say your not a atheist, you are saying you have a belief in some theistic idea. Is that correct?
Nice try
http://en.wikipedia.org/wiki/Agnosticism
read it all
bye