To say that your question surprises me would be an absolute understatement. The first clue would be with what particular language the New Testament was originally written in - which would of course be Greek. As Alexander had spread the Greek language across most of the known world, which also included parts of India by the 4th century BC; as the Greek language had become the lingua franca of most of the known world then this certainly made the spread of the Gospel much easier.
In addition, as the Apostle Paul was both a Jew and a Roman Citizen, this meant that as Latin was the language of Roman government, that he also had the ability to speak to those government officials who were sent from Rome to the more outlying regions who may have not yet been able to speak Greek.
When it came to the inauguration of the giving of the Holy Spirit to the Church, which was also accompanied by tongues of fire and the sound of a rushing wind, then you would be correct! But this was only with the Day of Pentecost where this event was never repeated in Acts and of course in First Corinthians Paul absolutely rejects the notion that praying in the Spirit (tongues) is spoken in anything else but an inarticualte (angelic) utterances - that's Bible 101!
As my special interest is with Pnuematology and where I currently own 14 contemporary commentaries on First Corinthians, it would be a very brave (and probably a very foolish) theologian who would ever dare say that praying in the Spirit has any connection with human languages. Though Craig Keener in his monumental work on Acts does make the claim that tongues can be used in this way (in addition to angelic tongues) to reach the unsaved; but as this is a very odd thing for such an intelligent person to say (as he should no better) then I am still trying to source some more information to work out his rather strange reasoning on his position.
Since before the early 80's the notion that tongues is supposed to given in a known human language has gone the way of the Do-Do bird where it is seems to be only found primarily within non-academic sources. It's one thing for a cessationist theologian to still claim that tongues have ceased (without any evidence) but most cessationist theologians would recognise that tongues "were once" given in an inarticulate form of utterance.
You seemed confused.
First, lets go back to the Tower of Babble.
As a curse God caused confusion within the languages. They were unable to speak and understand each other in there own language. They were speaking languages that we are familiar with today,such as Greek,Latin, Aramaic,English, Spanish.A person speaking Greek to some who only speaks and understands English is speaking in an unknown Tongue. "Tongue" translated means "Language". In order to bridge the Gap between Languages God had to provide a Gift to help spread the gospel since the Cannon of scripture was not complete and had not been translated to other languages.
On Pentecost , we clearly see that the Gift was to speak in other languages.Do you know why the Paul is writting to the Corintians?It is because they were a church in ERROR and without UNDERSTANDING, they misused the Gifts of Acts 2 which is Tongues, the ability to speak in another HUMAN LANGUAGE not originally known to the speaker.That is why is is making points throughout the whole book on different subjects.Whether he was talking about Love,Tongues,Women speaking in the church and many moral issues they had.He addressed the issues. They asked and he answered"Now concerning the things whereof ye wrote unto me" Corinthians 7:1.
Paul addresses The Gift of Tongues to correct them. When he is addressing the Corinthians it is in a negative way, they are not doing something that one should be proud of.
When you read Corinthians 13 the Topic is about love,not tongues.You would see that if you continue to read the rest of the verses following the very first verse of Corinthians 13.
"
Though I speak with the tongues of men and of angels, and have not charity, I am become as sounding brass, or a tinkling cymbal." Heres that major verse that is used to justify a so called angelic language.The Word
Though is Hypothetical. Now read it as "I
f I speak with the tongues of men and of angels, and have not charity, I am become as sounding brass, or a tinkling cymbal.
If you take this as a factual statement about Paul
speaking with the tongues of angels then you have just said that Paul doesn't have Charity either.
Say Paul did speak in the language of angels.The language they would speak ACCORDING TO THE BIBLE would be human languages.Where did anyone in the Bible who came in communication with an angel have a hard time understanding them?No where, because they spoke in which ever language was understood.
How does one create a list of languages in the bible?You study the individuals of choice and you will develop an idea of what language that spoke .Same thing with every time an angel communicated with someone.It was always a human language.If Paul spoke English , would it not make sense to in English as well. Did you catch what I did there? I gave you a hypothetical situation.Did Paul speak English,no but the point of me saying this was to show that it would make sense for one to communicate in the same language as the hearer.