Surely you have a belief in gods or you don't? Anyway what you are saying is similar to what many atheists here are also saying. They don't believe in any god/gods but they are not claiming that any definitely don't exist. As do I. Our position is similar. I call myself an atheist because as I don't believe in any gods, while you call yourself an agnostic. Anyone who lacks a belief in any deities can be called an atheist.