“Hashem also has enough ability to heal them outright, and doesn’t do so.
My point was that if we aren’t suppose to donate organs, then we can safely assume that Hashem isn’t going to cause more of us to die for that. We can safely assume Hashem runs the world and can make those who He wants to live, live; and those who He wants to die, die; regardless of whether we decide to donate organs.”
There already exists a religion with that philosophy; Seventh Day Adventists.
Also, a recent g’mara discusses the argument you pose, but in a different manner; a ben nachor posed an argument against yiddishkeit: Hashem made people poor so He, therefore, does not want people to give charity to help out the poor. Sounds very much like your shita.
And if a yid can’t give an organ to a yid, as you say; then a yid can’t take from a yid. So I feek feel sorry if c’v you will need an organ and only a yid’s is available. But then, maybe you’ll rely on Rav Moshe.