Not to mention that this whole test was supposedly because Satan said humans could rule themselves and didn't need god. But from what the bible and JWs teach, God and satan never once left humans alone to try and rule themselves. From the very beginning of the Bible, you have them both meddling in human affairs trying to sway things their direction. Stories like the one about Job, which was basically just a bet, and God "hardening Pharaoh's heart", to even today, when JWs think Satan has control over every facet of government and religion.
What would that be proving? All it is, is a universal pissing contest between God and Satan. The very basis of their core doctrine is flawed, it makes zero sense.
And yes when the JW teachings crumbled, it took any belief in God or the Bible with it.