Oh don't forget about wine becoming his blood. Whether it be symbolic or literal it's still pretty messed up. Not religious, no cannibalism required.
Wow! I thought I was a deep thinker, but I never thought that deep about, the 'crackers' being cannibalism...did think about 'wine' (grape juice), being blood. But, the whole notion could go back to ancient times, when they really did eat the dead? But, why would we need anything about food out of that ancient wisdom, in today's modern society? Most of society has enough food sources, at least in the Christian part!