"God" means God. Bigfoot means Bigfoot. Aliens means Aliens.
There is a sharp distinction to be drawn philosophically between the question of the existence of God and the question of the nature of God. The latter is the province of religion and has nothing to do with my proof, or with my interest in discussing God in this forum. Stories about the nature of God (religious doctrine) are matters of faith. My interest is in discussing the existence of God philosophically, and not at all in discussing religious faith.
The silliness to which Internet Skepticism is prone results in talk of the Flying Spaghetti Monster, Bigfoot, Santa Claus. This is silliness spawned by the New Atheism, and it is not worth a moment's serious consideration.
Again, you seem to be missing the point. You laid out a logical argument with premises and supposedly, a conclusion that logically follows from those premises. There is nothing in your argument that is specific to the subject ("God"). Because of that, anything that we don't have reason to believe in can be substituted for that subject and the logical argument follows (setting aside for a moment the assumption that the premises are true and the conclusion logically follows).
That's not good for the validity of your argument.
Let's say that I have a logical argument for why vanilla tastes better than strawberry. Let's say that we ignore validity and soundness of the argument for a moment, but just concentrate on the argument, itself. The argument itself, isn't intrinsic to what vanilla or strawberry tastes like at all.
1. Vanilla is white
2. White is the best color
3. Strawberry isn't white
4. Strawberry isn't the best color
5. Vanilla is better than Strawberry.
I can change "Vanilla" to "Chalk" and the argument would then prove that "Chalk" tastes better than Strawberry.
Get what I'm saying? There is nothing in that argument specific to "God", so you can substitute anything that we don't have reason to believe in for "God" and the argument works the same...therefore, it doesn't work.
What I'm doing is basically a Reductio ad absurdum type of argument. I'm showing that if you follow the logic of this argument, it produces poor results, regardless of when it is valid and sound.