Given that the Christ Spirit is considered to be One with God, and indivisible from God, you could eat or drink anything whatsoever, and be partaking of that Spirit in a ritual way...because God, being infinite, is by definition not apart from anything.

To call it cannibalism is ridiculous. How do you cannibalize an indwelling Spirit?

How does one truly commune with the Christ Spirit? By sharing the awareness of that Spirit...meaning, by sharing its love, compassion, mercy, and understanding.

Oddly enough, there seem to be 2 lots of literal-minded people out there...religious fundamentalists at one extreme and people who are against what they call "religion" on principle at the other extreme. Those 2 groups heartily detest each other, but that may be because they already have so much in common. They are both literalists, and seem to have great difficulty grasping symbol and metaphor. :-)