We need this kind of theories
To understand the world, our kind and the universe itself, we need to think about all possible things, regardless how paradox they might sound, thats why I respect spirit science. It might be confusing and bite itself with our well known way of the human history and logic (which I trust in aswell) , but still, it throws a whole new perspective onto things, if its right or wrong. And You rly bring up several good arguments. Alot of things actually make sense , even though in a kinda weird way. Every different perspective saves us from getting "blind" and one-sided, which would end up srsly bad. Personally , I think that a bit of everything is the truth, its just a riddle how to combine things together. Every theory has their strong and weak sides, but still , all are mostly theories. Even facts could be wrong, we know far to less to judge that. So , Instead of saying its wrong, just say it might be possible. That way people get more open minded and might find the truth sooner then we ever expected. It will take some centuries till we receive the so well known "oh christ, we should have thought about that" moment though.
So, Keep up the good work, you might end up giving someone the final clue how to understand us and the universe(aswell as the whole spirit science ofcourse).
And dont forget to stay open minded for other perspectives aswell, every possibilitie brings us closer to owning every piece of the ways to big puzzle.
Randael