A Deductive Proof that G-d is One

We will prove using deductive logic that G-d is One, i.e., He cannot be composed of multiple parts:

Let us suppose, for the sake of contradiction, that he is composed of many parts (at least two). Then since G-d created everything except for Himself and none of these individual parts are G-d, he must have created these individual parts. But since these individual parts are, by our supposition, necessary for him to exist (since he is composed of them), he could not have created them, which contradicts our earlier statement that he must have created these individual parts. Therefore, G-d is One, i.e., He cannot be composed of multiple parts. QED

Note: Only pronouns which refer to G-d in true statements are capitalized, out of respect for G-d.