Poking my head in for this one.
I was raised in an Apostolic Pentecostal church. We were “Holy Rollers”. The really ape-shit-crazy-for-Jaysus types. We took the Bible literally. Yes, literally. Not the “sorta-literally, but not really” way, but the “we only don’t kill witches and rape victims because Jesus said to follow Caesar’s law” way.
Apostolic Pentecostals believe in baptism of the Holy Ghost with evidence of speaking in tongues as the initial sign. Without “receiving the Holy Ghost”, one is not actually saved. (Mark 16:17, Acts 2:9, 2:38–39)
There are several forms of Speaking in Tongues, according to my former church (hereafter the UPCI). UPCI doctrine states there is “Tongues and Interpretation” – which is where a person speaks a language they do not know, and another person interprets it. There is the non-prophetic Tongues – which is direct communication between the speaker and God, meant to edify God. This can be done in private (as encouraged by Paul in I Cor 14) but it is not forbidden to be done in public (same epistle, little later in the chapter).
In the book of Acts, onlookers were astonished at seeing both Jews and Gentiles worshipping together and speaking in tongues. This encouraged the onlookers to join them, and thus the UPCI considers it a positive thing to openly encourage speaking in tongues as a sign of God’s presence.
Some Charismatic churches I’m aware actually teach tongue-talking. This is not done in UPCI sects. One must find their own voice.
On the outside, you can pretty easily judge a person’s creative aptitude by their “Tongues”. The denser among us had a repetitive strand of single-syllable sounds like “O ko no po ko no see!” that would repeat ad infinitum. My husband and I somehow managed to sound quite a bit like languages we were interested in outside of church.
For example, I watched a lot of anime as a teenager. My tongues sounded like a bastardised version of Japanese. This wasn’t at all obvious to anyone, including myself, and was never questioned. My husband sounded like something out of The Mummy. He is SERIOUSLY into Egyptian history.
Looking back, I recognize that speaking in tongues is a psychosomatic reaction to an intensely emotional experience. You, along with a few, or a hundred, or a few thousands of other people, are all sharing in this prayer meeting, with building fervor, until eventually your brain snaps into whatever gibberish it can spout out. Eventually you find a comfortable rhythm. If you never think any deeper into it than “This is what God wants”, you’ll happily go on speaking in tongues forever.
Once you start doubting god, though, you can’t even FAKE the same tongues you used to say. The mental connection is just not there. I can sort of half-hear them if I try to remember it, but I don’t think I could repeat the words.