Which item do you think is not supported?
"They each heard in their own language..." Acts 2
Anyone reading Acts 9-11 will see that the subject is not tongues. Tongues there show Peter that he had misconceptions about including Gentiles. They happen because God wanted to make that point. The sheet vision was not enough! Paul validates that this is what tongues were for in I Cor 14:21, and there simply were fewer and fewer situations like it, the last being Acts 19, years after Peter and Cornelius.
In I Cor 14:5 Paul meant 'if it will help an unbelieving Jewish person realize that God works among the nations, I would like it to happen to them.' Because that was the purpose of it throughout the manifestations of it.
Granted there seems to be something else going on at Corinth that lacks this purpose, yet Paul corrects them with v21 and its quote from Isaiah and Deut.
If God was just trying to communicate to minor languages, there would be no need for Bible translation missionaries. But that was not the intention. The intention was to show to unbelieving Jews that the prophecies of God bring the nations to faith were true indeed and in motion in the Gospel era.
Which one of the following verses do you object to?
Acts 2:11 Speaking in tongues is speaking the wonderful works of God
Acts 10:46 Speaking in tongues is magnifying God
I Corinthians 14:4 Speaking in tongues is for the spiritual edification of the one speaking in tongues. To edify is to build up, strengthen
I Corinthians 14:2 Speaking in tongues is speaking to God, speaking what? mysteries or divine secrets
I Corinthians 14:16-17 Speaking in tongues is to give thanks well to God
that is a few of the reasons that God tells us from scripture, why God designed and set up the manifestation of speaking in tongues.
I want those results in my life, so I speak in tongues.
Speaking in tongues is a manifestation of the gift of holy spirit that is given to all that do Romans 10:9-10
I Corinthians 12:7-11
But the manifestation of the Spirit is given to every man to profit withal.
8 For to one is given by the Spirit the word of wisdom; to another the word of knowledge by the same Spirit;
9 To another faith by the same Spirit; to another the gifts of healing by the same Spirit;
10 To another the working of miracles; to another prophecy; to another discerning of spirits; to another divers kinds of tongues; to another the interpretation of tongues:
11 But all these worketh that one and the selfsame Spirit, dividing to every man severally as he will.
The manifestation of the spirit has nine ways to profit withal included in it.