As the title says, if he exists, can Biblegod be destroyed? Given enough time for technology to develop of course.
I'm going to say yes, he can be destroyed.
If we take biblegod as a given, there are a ton of clues that would indicate he is not, in fact, indestructible.
- Genesis. H shows many chinks in the armor here.
First, we learn he is not omni-present nor is he all-knowing. While Eve and her slow witted mate were gaining moral knowledge, yhwh was out for a stroll. Then, when he comes back, he asks Adam where he is and he had no idea how they knew they were naked! He asked who told them!
Then he kicked out Eve and her slow-witted mate not because they disobeyed him, but because he was afraid they would eat from the Tree of Life and become gods like yhwh and the others. He was so concerned about it he stationed two Cherubs with flaming swords to protect it. If we could break into Eden and get some fruit from the Tree of Life, we could be immortal. Given that yhwh apparently could not just undo the effects of the Moral Knowledge Tree, and his level of concern that they not get to the Tree of Life, I think we can guess that once we become immortal, there isn't squat yhwh can do about it. This is the key to our victory.
Now, I know cherubs are terrifying, or at least they were to the Iron Age hebrews. But I would not count on flaming swords doing much to an M1A1 Abrams Main Battle Tank.
- Iron Chariots. As mentioned above by OAA, Iron Chariots did indeed defeat the hebrews, even though yhwh was with them. Again, I look to an M1A1 main battle tank. If yhwh cannot beat them, I cannot see how is lesser minions will fare any better. It is important to note that the iron chariots did not exactly beat yhwh. They beat his guys, the jooz. The iron chariots only apparently neutralized yhwh's blessing (buff?). So given that, we may still need another way to kill him.
- Wrestling. At one point Jacob wrestled yhwh and won. It took all night and he had a gimpy hip from then on, but he kicked yhwh's ass but good. The bible is a little vague on this. At one point it says it was god, another it says a man, and it also implies it was an angel. Jacob's new name - Israel - is a theophoric that means "struggles with god". So, I am leaning toward it being god.
Training in Brazilian jiujitsu will give us an edge.
- Burnt offerings. We know that yhwh loves the smell of some Babby-Q. I propose that not to soothe his wrath, but possibly as a distraction while we get the MMA fighters and tanks in place.
So that's the plan. Train up in MMA. Bust into Eden and acquire godlike immortality. Lure yhwh in with a cook-out. Bring in the tanks and Choke. Him. Out.