It is and it isn't
Can something exists and not exist? Of course not you say. But think about it as possible for a minute. Can you FEEL the cognitive dissonance? Now continue to contemplate the possibility until you discover how to make the dissonance go way WITHOUT compartmentalizing. This is the essence of "mystical" experience. To accomplish it you need to essentially learn to "silence" your mind . Which brings me to my point. "Silence your mind" is not accurate. In fact, there is NO language based description for such a state of mind for when it is acheived, language is absent. I think this is a huge problem when supplying evidence regarding god. Such a state of mind CANNOT be described empirically or logically because those are both language based. And yet such an altered state of conciousness can be acheived and even measured. The crux of the matter is the interpretation of the state of conciousness. If I devise an experiment that through electrical stimulation induces the same brain wave patterns as somebody in a deep meditative state have I duplicated the experience or just the neurological presentation of a mind state? Is it really the same or is it like vanilla from a bean v.s. artificial flavoring? An undiscerning palate may not be able to tell the difference between natural and artificial vanilla, but a good chef can. And so where does the experimentalist justify the conclusion "I have duplicated mysticism" when all they have duplicated is a similar pattern of neurological activity?
Note that I am NOT offering such experience as evidence for god. All I am thinking about here is the fact that such altered states of conciousness are duplicatable, can be acheived through training, and can be measured. But none of that tells me how to interpret the experience. I would suggest that you cannot divorce the experience from the context. If you induce such a state through electircal stimulation, it will "taste" artificial, especially to an experienced practitioner. And if you acheive such a state through religious contemplation, it "tastes" different than if you acheive it through a more secular or non-theistic pathway.