Ha, you still BELIEVE that there is nothing there! You can't know for sure though (because gods and higher beings have the habit of avoiding forensic evidence to their existence or non-existence), so the belief ingredient is similar to religion, especially since most atheists don't want a higher being to exist. Us agnostics don't care either way, we find there is no proof either way, but we have no preference. Agnostic comes from Latin and means "no belief", atheism is Latin too and means "no god".
Or as Edith says: "Agnostics are just too chicken shit to form a real opinion."