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“And suddenly there came a sound from heaven, as of a rushing mighty wind, and it filled the whole house where they were sitting. Then there appeared to them divided tongues, as of fire, and one sat upon each of them (Ac. 2:2-3).
The outpouring of the Holy Spirit was immediately preceded and accompanied by sensible signs exhibited to both the ears and eyes of those assembled. The two signs were wind and tongues of fire.
I have found a few different sources for this information if you would like to look further into it. Brian Schwertly's "Pentecost and the Coming of the Holy Spirit" and Russell Byrum's "Holy Spirit Baptism and the Second Cleansing."
Russell Byrum's "Holy Spirit Baptism and the Second Cleansing"
...because that on the Gentiles also was poured out the gift of the Holy Ghost.
46 For they heard them speak with tongues, and magnify God. Then answered Peter.
My take on it: This has nothing to do with the whole household of Cornelius speaking tounges. Cornelius was last mentioned in Acts 10:31. This isn't the household, this is the holy spirit speaking "WITH" tounges - meaning they could be heard and understood. Perhaps even the Holy Spirit Speaking through Gentiles "who also poured out the gift of the Holy Ghost". Nobody was talking in this imaginary langueage CALLED "Tounges"
And again: Acts 19:6, when a group of approximately a dozen men spoke in tongues in Ephesus as they received the Holy Spirit while the apostle Paul laid his hands upon them.
Not exactly - here is the text "And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied.
My Take: My sentence construction tells me we're referring to the holy spirits talking "with toungs" meaning in an audible and understandable way.
And there are many more. So I agree with what you are saying. In the instances where some interpret that "Tounges", a nonsensical language was spoken, it's actually something more profound - like people of different cultures understand each other in their own tongue. That's remarkable, and That's a sign all by itself.
And for the people that have talked in tounges? If they've made up something to make them more comfortable believing, then good for them, but I don't think anything like that is really even referenced in the Bible when translated and then interpreted correctly.