Can I remember this right? I'll check when I get home tonight...
"And when they had supped, Jesus took bread, and broke it, and said, 'This is my body, which is broken for you. Eat it, all of you, in remembrance of me.'"
Sounds pretty cannibalistic, or at least theophagous, to me. The ritual is specifically and explicitly about "eating flesh and drinking blood," and involves a god that was "fully man" as the meal. That's cannibalism. Yes, it's symbolic, unless you're a transsubstantion fan, but that doesn't change Metatron's point.