With all due respect, when it comes to the study of Biblical 'tongues', whether one is born again or not is completely irrelevant. The modern phenomenon is what it is.
There are many things which must be taken on faith; they can neither be proved nor disproved. “Tongues” however, is not one of these things. They are something very tangible and concrete. Tongues can be, and have been, studied and analyzed as a phenomenon for decades (i.e. the advent of modern linguistics), with all studies yielding the same conclusion.
Literally thousands of examples of tongues-speech have been studied and not one has ever been found to be a real, rational language, living or long dead. Modern tongues-speech is non-cognitive non-language utterance, and is characterized as I detailed in one of my original posts/comments. There just isn’t anything a tongue speaker is producing that cannot be explained in relatively simple linguistic terms.
That said, as I mentioned in my original post, I am, not doubting or questioning the 'tongues experience'; glossolalia as the spiritual tool that it is, can be very powerful and, for many people, the experience is profound.
As one commenter put it, “Speaking in tongues distracts the ego/analytical/conscious mind while leaving the subconscious (the heart) wide open to import the divine." Both the spiritual and physical benefits of using this tool are also well documented.
Again though, it is important to note that this same statement can be made for virtually any other culture that practices glossolalia. Religious and cultural differences aside, the glossolalia an Evenki Shaman in Siberia, a vodoun priestess in Togo and a Christian tongues-speaker in Alabama are producing are in no way different from each other. They’re all producing their glossolalia in the exact same way; they just have different explanations and beliefs as to why they’re doing it, and where it comes from.