I'm by no means educated about ways how RNA could get from food into your own cells, but saying "RNA is dissolved by stomach acid" is a bit too easy. HCl peaks only after a big meal with protein, and some people generally have low stomach acid. Then there's the mucosa of the mouth and esophagus, through which some food is absorbed before it even hits the digestive organs (even bypassing the liver AFAIK). It might still get dissolved as soon as it hits your bloodstream, or destroyed by antibodies, etc..
Not to the extent that you (and many others) believe. The stomach is always very acidic (pH 1–3), and this acidity is tightly regulated. Contrary to what you’ve said, the pH is raised (and hence acidity lowered) when consuming food (because HCl is used up in the digestive process). That said, much of the digestion of RNAs happens through enzymes, not acid, so the point is moot. It’s known that the human GI tract is highly efficient in digesting oligonucleotides. Very little (and of that, only small fragments) has a chance of being taken up.
