Part 2 –
The plain fact however, is that the “tongues” Pentecostal and Charismatic Christians are producing today is an entirely self-created phenomenon ...
The Apostle Paul's explanation of tongues debunks your cited opinion.
Paul makes it clear that one speaking in an unknown tongue is speaking unto God. Obviously through the connection of God's Spirit to mankind's spirit when He initially infiltrates their body. (1 Cor 14:2)
See 1 Cor 14:4: the one speaking to God via the Spirit connection is edified.
Paul's comment in verse 14 confirms he does not understand what he prays in the spirit. "...my understanding is unfruitful."
Paul goes on to express there are times he understands what he is praying and singing. And there are times he has no idea what he prays and sings. Clearly what is coming forth is a result of the Spirit connection. Due to the biblical record one can conclude that Paul was confident that whatever God was placing in his spirit was necessary in order to fulfill God's will in one way or another. Paul was willing to give God full access to his body. This proves he was not a control freak. He humbled himself for the purposes of God.
Paul confirms speaking in tongues is speaking in an unknown language in verses 18 and 19. First he expresses he is thankful that he has the ability to speak in tongues a lot. Clearly he is edified immensely due to the direct connection to God in praying that way. Secondly, he mentions that speaking ten thousand words unknown words in the church will have no benefit to the hearers. So he would rather speak five words in a language church members know so they would benefit from what he is saying.
My confidence is and will always be steadfast in the Word. The bible alone contains God inspired information by which everyone will be judged. On judgment day no one will be excused because they chose to believe a man's opinion that attempted to explain away the truth God provided for equipping His bride to do His will.
1 Cor 14:2
For he that speaketh in an unknown tongue speaketh not unto men, but unto God: for no man understandeth him; howbeit in the spirit he speaketh mysteries.
1 Cor 14:4
He that speaketh in an unknown tongue edifieth himself;
1 Cor 14:14-15
For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful.
What is it then? I will pray with the spirit, and I will pray with the understanding also: I will sing with the spirit, and I will sing with the understanding also.
1 Cor 14:18-19
I thank my God, I speak with tongues more than ye all:
Yet in the church I had rather speak five words with my understanding, that by my voice I might teach others also, than ten thousand words in an unknown tongue.