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Because they require a material system of some form to explain the presence of the material system

I think that would be “infinite regress”, z because y, y because of x, x because of w, and on back, but we don’t even know what letter we are at with the Big Bang and quantum bubbles because we don’t know if there is something else that caused those things or how things work outside of our cause and effect universe.

Your’s is circular because you are saying that “an explanation that does not rely in material quantities” is a supernatural one, but you are defining “not relying on material quantities” as supernatural.