It's more similar to breastfeeding, really, than cannibalism, but both analogies fall very short. I am happy to own the cannibalism charge, tho, as it was thrown at the first Christians and is proof of the tradition of the Mass.

>> At the last supper, Jesus did say, ‘This is my body’ and ‘This is my blood’. So the Church developed the theory of transubstantiation. This is still Roman Catholic doctrine: that, even though the appearance of the bread and wine remains unchanged, their all-important inner ‘substance’ is radically and really changed into the actual body and blood of Jesus.

The opposite, very Protestant view is that the bread and wine are simply symbols of the living Christ. The Church of England’s middle position since the Reformation, shared by most of the Reformed churches, is of the Real Presence of Christ in the bread and wine.<<