Agnostics claim that there isn't any proof one way or the other that god exists. That's true. There isn't. However, based on common sense and on the balance of probability, there's more proof against god existing than there is for him.
Be careful with the common sense thing. There are many on this site who were talked into believing in God and Satan and the bible, based on common sense, who today don't believe a word of it.
I believe that a preponderance of the evidence tends to make me lean towards atheism as well and I respect your belief in atheism but I keep my mind open until it's proven one way or the other.
I don't believe that if it was ever proven there was some kind of a god it would be nothing like what we could ever imagine or have imagined, but it is only a belief.