Before We Discuss Whether God Exists, I Have A Question

[Succubus]

I'm not sure that's true.

All you could test for was a known naturalistic cause. Absent that, most atheists will just claim miracles have unknown naturalistic causes.

And you accuse other of question begging!
The means by which miracles occur are completely irrelevant until you first show  a miracle has taken place then we can discuss the cause. To date there is no evidence that such an event has ever happened.  

Most atheists deny the personal experiences of Christians as some sort of delusion/misrepresentation/misunderstanding/confusion. There is nothing to 'test' because the other side of the equation is supernatural and as a result, cannot be detected in a lab.

If the supernatural were real it would be trivially easy to detect.