I'm new here, but I understood the OP to mean the God of the bible. If that is so and he does exist then he can't be destroyed, because he cannot not exist. If there was a God who could be destroyed, it wouldn't be the God of the bible.
Not necessarily (pardon the pun
). What is "the Bible?" It is a collection of books purported to be a revelation from a god (Yahweh). Even if the god himself exists, it does not logically follow that all of the claims made in his promotional literature are true. That one of those claims is "Everything in this collection of promotional literature is true!" does not necessarily make it so. In other words: it is logically possible for a god to exist, yet lie or make exaggerated claims about its power, or for humans (perhaps well-intentioned but misguided, or just mistaken) to make such claims on its behalf. A political candidate saying "Hi, I'm Congressman Munchhausen, and I approve this message" does not prove that everything in the campaign ad is true.
For evidence from the Bible that Yahweh's alleged claims to things like omnipotence or philosophical "necessity" are hyperbole or exaggeration (or perhaps incorrect interpretations of the text), I refer you to this post
The Bible goes so far as to state unequivocally that we did
kill Yahweh, even if he did respawn a couple days later. Does the phrase, "Jesus died for your sins" sound familiar? Either this is true--and for awhile there were only two
Persons in the Trinity--or it isn't, in which case the "salvation plan" of Christianity is false anyway.
If there's one thing that the Bible makes absolutely clear from beginning to end, it's that Yahweh really. Really. Really.
Needs human worship and obedience. If such things are not forthcoming, he is consistently and universally portrayed behaving just like a cornered and starving animal facing an existential threat to its survival.
Which means we can kill Yahweh exactly the way we killed Zeus: by ceasing to worship and obey him, and putting his stories in the Mythology section of our libraries and bookstores.