I’m afraid matter and energy are provable concepts. Or more accurately, disprovable concepts that so far nobody has been able to disprove. True, they are names we give to the shape our experiences of the world take, but the fact remains our experiences take a shape and, given we have the gift of language, we must name these phenomena something. Saying matter and energy are just hallucinations merely begs the question what exists that gives off this appearance of matter and energy and who it is that’s doing the hallucinating? If the hallucinator isn’t made up of matter and energy, then what his he/she made up of? You may protest that experience has nothing to do with your body or nervous system, but being a felt experience it MUST have something to do with something. What is it?
As for God, I don’t deny that people have experiences they consider spiritual in nature. However, in so far as that experience is interpreted as relating to something real out there that cannot be seen or otherwise detected as opposed to something real in here, the experience itself is not sufficient to prove the existence of the thing the experience is being attributed to. Hallucinations are real physical experiences. They can even be induced. However, by definition they occur entirely within and lack any relationship to things going on outside the body. This doesn’t make them necessarily any less meaningful in so far as they are part of a spiritual experiences as opposed to a mental illness of some sort. I’m even willing to go so far as to say in that context they are true in a way. However, some truth comes in the form of metaphor or meaning, not in the form of facts about the physical world.