Why do people believe that communion, eating and drinking the blood of Christ, is witch craft?

I mean I can get why they look at as as witch craft but as believer I see the biggest difference in that Jesus wasn’t a man, he was holy while other forms of rituals (witch craft) such as burning sage, comes from men who are in fact sinners just like the rest of us and it isn’t as simple as eating a cracker and drinking cranberry juice.

Why do people believe that communion, eating and drinking the blood of Christ, is witch craft?
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