Considering that religious offshoots typically occur because of disagreement in teachings and interpretation, no, they’re not bound to their origins at all.

symbolic ritual cannibalism

Lmao, you’re grasping at straws mate.

Spirituality ≠ religion.

I didn’t say communion was only a catholic tradition. I said transubstantiation (the thing that you were talking about that I replied to) is only a catholic tradition. Calling transubstantiation cannibalism is one thing, but calling communion cannibalism when it is entirely symbolic is absolutely a stretch.

As you said though, that’s a Catholic tradition, not Christianity as a whole, and it isn’t directly supported by the Bible. Its their unique interpretation of the act of communion. The actual text seems pretty metaphorical IMO.