Disproving Odin - An Experiment in arguing with a theist with Theist logic

[Angrboda]

...it seems that a firm feature of reality is that being can only come from being.

Please explain what you mean by being coming from being and give an example. I'm aware that in quantum mechanics there is the concept of uncaused events and that existence essentially means collapse of the wave function, without which the being of something is indeterminate (see Bernard D'espagnat on Bell's inequalities, HERE), but neither of those appear related to what you are claiming. There is, I believe, some support that new particles can appear out of nothing, but since that is ex nihilo, that would actually be a contradiction to your claim. Then there is the existence of virtual particles, but that again seems more like a refutation of your claim rather than a confirmation. Aside from that, as far as I know, matter has never been observed to have been created or destroyed, so I am not aware of any example from reality in which matter literally came from matter unless that matter is just a reconfiguration of previously existing matter. But that would make your phrase "being can only come from being" only true in the figurative or metaphorical sense, and if that is the sense in which you are interpreting statements such as "began to exist" then you seem to have some equivocation going on. So what do you actually mean by being "coming from" being?