Defining Atheism & The Impossibility of God's Existance

Defining Atheism & The Impossibility of God's Existance
OUR ARGUMENTS

Lets define Atheism (a=lack of, theism=belief of a god). . Therefor, someone who has lack of belief in a god, would be an Atheist. Like it or not, EVERYONE is an atheist one way or the other. Stephen Roberts once said, "I contend we are both Atheists. I just believe in one fewer God than you do. When you understand why you dismiss all other possible Gods, you will understand why i dismiss yours." By definition, if you say you do not believe in Yahweh, Allah, Judah, or Zeus, or whomever, you are an atheist..
“Lack of a belief in a god” is “not believing in any god”. Which is different to only believing in one God.
The opposite of atheism according to this definition would be someone who believes in a god. Therefore, as someone with belief in a god, I am not an atheist. How can I be an atheist, and the opposite of an atheist, at the same time? It is not possible! Atheism, a dictionary definition, is bel...