If 1 Corinthians 14:22 was so the unbelievers could understand tongues, why in verse 23 would they call them crazy?
Once again, your mind is in gear with the falseness you have been taught about the cloven tongue, because Apostle Paul in 1 Corinthians 12-14 was NOT talking about the cloven tongue of Pentecost. He was talking about KNOWN LANGUAGES of the world, INCLUDING IN THAT 1 COR.14:23 verse you mention...
1 Cor 14:23
23 If therefore the whole church be come together into one place, and all speak with tongues, and there come in those that are unlearned, or unbelievers, will they not say that ye are mad?
KJV
I'm surprised no one has brought that above phrase
"those that are unlearned" to your attention. And it does refer in the Greek to one who is uneducated. Thus Paul is speaking of known languages with that unlearned idea, because the true cloven tongue of Pentecost IS NOT LEARNED!
Now then, rightly understanding that above verse, the correct... interpretation is... if all the members in a Church speak a different language all the same time, THAT is what would be madness. And if NEW potential unbelievers came in and saw that, they indeed would think that whole Church was mad! That is what Paul is saying there, referring to KNOWN LANGUAGES, and not the cloven tongue of Pentecost.
FURTHERMORE... the 1 Corinthians 12 & 13 Chapters ALSO have references to shown Paul's subject is KNOWN LANGUAGES OF THE WORLD, and NOT the cloven tongue of Pentecost...
1 Cor 12:6-10
6 And there are diversities of operations, but it is the same God which worketh all in all.
7 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:
KJV
Per the Greek
"kinds of tongues" means KNOWN LANGUAGES, plural.
The cloven tongue is but ONE tongue and goes out AS known languages to those present (per Acts 2), so there is a difference. Some believers are given the gift of learning foreign languages, especially as it was like with Apostle Paul who spoke several different 'known' languages of the world. Paul was even familiar with the writings of the Greek philosophers.
1 Cor 12:28
28 And God hath set some in the church, first apostles, secondarily prophets, thirdly teachers, after that miracles, then gifts of healings, helps, governments, diversities of tongues.
KJV
Once again, that is NOT about the cloven tongue. It is about various KNOWN LANGUAGES of the world.
Here's a verse by Apostle Paul that goes deeper, but not if one is familiar with what God promised He will return all to speaking again in final per Zephaniah 3. And this proves again that Apostle Paul was speaking of KNOWN LANGUAGES is what is going to go away and be no more...
1 Cor 13:8
8 Charity never faileth: but whether there be prophecies, they shall fail; whether there be tongues, they shall cease; whether there be knowledge, it shall vanish away.
KJV
Some brethren even go so far as to wrongly interpret that above verse like it means the cloven tongue of Pentecost was ONLY for the time of the early Church, like in the Apostle's days, and then it has now ceased.
No, that's not what Paul is saying there. Paul is saying that today's KNOWN LANGUAGES of this present world, will eventually cease and be no more. How's that? It will be because like God promised in Zephaniah 3:9 that He will return us all to speaking the one tongue, so that we all may call upon Him with one consent.
Zeph 3:8-9
8 Therefore wait ye upon Me, saith the LORD, until the day that I rise up to the prey: for My determination is to gather the nations, that I may assemble the kingdoms, to pour upon them Mine indignation, even all My fierce anger: for all the earth shall be devoured with the fire of My jealousy.
9 For then will I turn to the people a pure language, that they may all call upon the name of the LORD, to serve Him with one consent.
KJV
Thus the cloven tongue, which represents the one tongue that ALL peoples once spoke prior to the tower of Babel event, is going to return to all peoples, and all the various known languages of this world are going to cease when that happens. That is the proper interpretation of that 1 Corinthians 13:8 verse, which again shows Paul was speaking of known languages, and not a gibberish tongue.
Also here in 1 Corinthians 14, IF... the actual written Bible Scripture is heeded, it becomes clear that Paul is speaking of KNOWN LANGUAGES of the world, and not a gibberish speech...
1 Cor 14:2-6
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.
Paul is talking about someone who speaks a foreign language those present do not understand, that's all. It is not about the cloven tongue, nor the gibberish some try to claim is the cloven tongue.
Some speaking a foreign language that no one present knows simply means only the person speaking it will understand. So how is it, that IF... Paul was actually talking about the cloven tongue, then why would someone else in the Church need to interpret, why does the speaker of the gibberish need an interpreter if this is about the cloven tongue? It is not about the cloven tongue. It is about known languages of the world which DOES need an interpreter who understands those languages.
3 But he that prophesieth speaketh unto men to edification, and exhortation, and comfort.
There's another verse the gibberish churches like to confuse. To prophesy means to TEACH with KNOWN LANGUAGES, with words easy to understand.
That clearly is NOT about a gibberish speech, nor the cloven tongue. But the gibberish churches like to claim their speaking gibberish as the cloven tongue, and requires that someone in the church interpret, is NOT about words easy to understand.
4 He that speaketh in an unknown tongue edifieth himself; but he that prophesieth edifieth the church.
How does one edify the Church Paul says there? With speaking known words that edify, which is what real prophesying is.
5 I would that ye all spake with tongues, but rather that ye prophesied: for greater is he that prophesieth than he that speaketh with tongues, except he interpret, that the church may receive edifying.
KJV
Paul is talking about known languages, as he spoke several languages of the world. And once again, per Acts 2, the TRUE cloven tongue of Pentecost
DID NOT NEED AN INTERPRETER.