DNA studies show we had thesame ancestors which implies they spoke thesame language, how we now have totally dissimilar languages all over the world is a riddle that may never be solved. At least names of basic things should have remained similar, dialectical differences developing into new languages that are structurally different is hard to explain. Some having genders, others being genderless and etc. There are many defining characters of languages with which they are classified. It appears relatively undisturbed languages retain tones and if a non tonal language is left undisturbed for thousands of years, it may develop accent, then tones, returning it to the natural state which is the tonal language. Most languages in Europe have lost their tones while many in Asia and Africa remain tonal. Ancient Greek was written like modern Yoruba, that is, with diacritical marks, for being a tonal language. Modern Greek is not even tonal. I believe this is true for all European languages.

Language is often not a true determinant of what a people are. Take Northern Nigeria for example where most of them speak Hausa, an Afro Asiatic language not known to their ancestors. Kano is said to have spoken a Niger Congo language in the past, maybe Nupoid but they now speak Hausa. This is according to a report I read.

The Yoruboid people of Igala, Yoruba, Itsekiri and Ebu may not have spoken their present languages in the past as up to half of their present vocabulary is derived from the language spoken in Kemitic Egypt of over 5000 years ago. The other parts coming from Nupe, Igbo, Edo, Afemai, Urhobo, Hausa and etc. The language has now come into its own but its origin is worth investigating. It is noteworthy that Kemitic Egyptian is not classified as Yoruboid or even Niger Congo despite the similarity with the Yoruboid group. The Igboid group that shares basic words with Yoruba as shown in Prof Bolaji Aremo's book 'How Yoruba and Igbo became different languages' is also not classified as Yoruboid. Language classification appears to be a bit ambiguous. The Fulani language is classified with Igbo, Yoruba and etc as Niger Congo and indigenous to Africa while the Hausa language is classified as Afro Asiatic. Its characteristic of having genders amongst other characteristics separates it from most other Nigerian languages.
It appears that if pidgin English is left for a few thousand years, it will probably be classified as Niger Congo. That appears to be the way language classification goes on.

So language often is acquired along the line and is never a true determinant of what a people are. Abraham would not understand a single word of any of the Semitic tongues for instance, neither would Moses, yet Moses would relate well with Jewish customs and traditions and Abraham would understand why Jews are fixated on Palestine. Abraham spoke the Sumerian language spoken in Iraq or Southern Arabia which is now extinct today, though some say the language is an archaic form of the Indian Tamil. Moses spoke a form of archaic Yoruba spoken in Kemitic Egypt. Modern Jews speak Hebrew, Arabic and Yiddish. Yet it can not be denied that Moses and Abraham are their people.

As examples of Kemitic Egyptian in Yoruboid languages or modern Ife language in Kemitic Egypt, modern Yoruba words like suegbe-fool, ekun-strong man, lareja-knowledge, mo-know, odun-festival and thousands of others were used in thesame way in Kemitic Egypt. You can research on google and elsewhere for more examples. Presently I do not know whether to say those words or our present language came from Kemitic Egypt or that we were speaking thesame language from the onset but the Awos do agree that we used to have another language, maybe the Akokoid languages in the past. One Awo I heard on radio stated an example by saying a house was called Arigidi in the past but Ile today.

As a similar example of language acquisition, the British are over 70 percent Celtic by genetic composition, but they speak a Germanic language originating from Germany. Their genetic makeup shows that at a point newly arrived ethnic Germans settled on the British isles to make the place around 30 percent Germanic by population, discounting polygamy by the newly arrived Germans but for one reason or the other, the whole population adopted the language of the new arrivals which has now become English. The remaining Celtic languages are totally different from English. Something similar may have happened in Yoruba land.

The lesson in this is that language is a part of culture and you are probably not speaking what your ancestors spoke but it is not the sole determinant of what a people are. For example, if many people you trade with, speak a particular language in your markets, you will eventually learn that language in your town, then start using it as a second language which may lead to subsequent generations forgetting the original language of their ancestors. Nigerians now use English as a result of such an effect, up to the early 19th century, the most popular European language in Nigeria was Portuguese.

In central Europe, like in Central Nigeria, people speak a variety of languages. A Swiss might speak German, English and some other languages. A Pole might speak German, Russian, Polish and others just like most Nupe speak Nupe, Hausa, Yoruba, English and one or two other. Some Okun Yoruba speak Yoruba, Ebira, English and one or two other. Many languages are being lost and have been lost but it will be good to have the world in as natural a state as possible by preserving cultures and languages while people learn lingua francas like English for the purpose of communicating with others, No reason why anyone should not be able to speak 3 to 5 languages including their cultural language.

If not for religions, human culture across the globe are basically thesame, much like saying thesame thing in different languages.