Sorry, that is the DEFINITION of ritual cannibalism.
As we can see, cannibalism and drinking blood played a part in a lot of religions, and some people would be surprised to hear that Christians practice a form of cannibalism even today.
John 6
52 The Jews therefore strove among themselves, saying: "How can this man give us his flesh to eat?"
53 Then Jesus said to them: "Amen, amen, I say unto you: unless you eat the flesh of the Son of man and drink his blood, you shall not have life in you. 54 He that eats my flesh and drinks my blood has everlasting life, and I will raise him up in the last day. 55 For my flesh is meat indeed, and my blood is drink indeed. 56 He that eats my flesh and drinks my blood abides in me, and I in him.
Later Jesus breaks bread and offers it to his disciples saying: This is my body. Then offers them wine saying: This is my blood.
Christians today practice the Eucharist where they eat a blessed wafer and drink wine. While there is a lot of debate about whether or not this is symbolic rather than literal, there is no difference between what cannibalistic tribes did for centuries, and what modern Christians do. The two elements of sympathetic magic are at play in the same ways in both cases.
The Christian is told to do this for several reasons depending on which book of the bible you want to read on the subject. In the supper event we see Jesus telling the disciples to do this to remember or commemorate him. But this is not a contradiction to what Jesus said before. He was clearly still alive and instructing his followers on how they should ingest him.
I tend to think Jesus meant it literally like the Catholics do. Their theory is called: Transubstantiation. It tells its followers that when blessed, the wine and bread become the actual flesh and blood of Jesus. The act of blessing actually transforms the material. This was decided at the council of Trent after long debate.
There was another side who favoured consubstantiation, which means that while the host and the wine remain what they are, they somehow, magically, connect the person eating it with Jesus. This was declared a heresy by the council of Trent, but became the official position of the Protestant churches after the reform.