NO, they speak in Ecstatic Utterance, and it is not an Earthy Language that had not been learned by the user. Ecstatic Utterances are Learned Behavior or a Psychological Phenomena similar to THE HINDU RELIGION, and NEITHER are of the Holy Spirit. It is a Natural Phenomena, not super natural, and the problem with that is NO ONE is HEARING in his own Dialectos, therefore IN RARE CASES, a demon can make use of an unsuspecting tongues speaker with out them being aware of it, to Curse Christ in the Sanctuary. Remember Peter was used to deliver a message from SATAN, what makes you feel IMMUNE. Now in the Modern day Charismatic or Pentecostal Churches, the hearers understand NOTHING, they rely on an unproven Interpreter, and NO unbelieving Jew or Jews are present. Every time it was used in the BIBLE an unbelieving JEW heard in his own Dialectos.
You can consider that to BE YOUR SECOND WARNING ABOUT BEING A DIVISIVE PERSON.
How do I know it has to be an Earthly Language ? ? ?
1 Corinthians 1:22 (KJV)
22 For the Jews require a sign,
and the Greeks seek after wisdom:
Acts 2:6-12 (KJV)
6 Now when this was noised abroad, the multitude came together, and were confounded, because that every man heard them speak in his own language. [.dialektos - is an earthly language so correct even the ACCENT is Correct.]
7 And they were all amazed and marvelled, saying one to another, Behold, are not all these which speak Galilaeans?
[.What was amazing is Galilaeans had a strong accent, and none could detect it.]
8 And how hear we every man in our own tongue, wherein we were born?
9 Parthians, and Medes, and Elamites, and the dwellers in Mesopotamia, and in Judaea, and Cappadocia, in Pontus, and Asia,
10 Phrygia, and Pamphylia, in Egypt, and in the parts of Libya about Cyrene, and strangers of Rome, Jews and proselytes,
11 Cretes and Arabians, we do hear them speak in our tongues the wonderful works of God.
12 And they were all amazed, and were in doubt, saying one to another, What meaneth this?
Malachi 3:6 (KJV)
6 For I am the LORD, I change not;
therefore ye sons of Jacob are not consumed.
ANYTHING LESS IS A COUNTERFEIT, ASK ANY JEWISH CHRISTIAN.