Why do we(People on the Planet Earth) have Differnt Languages Today ?

Please listen to this. Pretty well versed account of the theory behind the Tower of Babel.

Not to mention it is a part of our belief system also. Most of it anyway.

From Wiki:
Qur’an and Islamic traditions

Though not mentioned by name, the Qur’an has a story with similarities to the Biblical story of the Tower of Babel, though set in the Egypt of Moses. In Suras 28:38 and 40:36-37, Pharaoh asks Haman to build him a clay tower so that he can mount up to heaven and confront the God of Moses.

Another story in Sura 2:102 mentions the name of Babil, but tells of when two angels taught the people of Babylon the tricks of magic and warned them that magic is a sin and that their teaching them magic is a test of faith. A tale about Babil appears more fully in the writings of Yaqut (i, 448 f.) and the Lisan el-'Arab (xiii. 72), but without the tower: mankind were swept together by winds into the plain that was afterwards called “Babil”, where they were assigned their separate languages by Allah, and were then scattered again in the same way.

In the History of the Prophets and Kings by the 9th century Muslim historian al-Tabari, a fuller version is given: Nimrod has the tower built in Babil, Allah destroys it, and the language of mankind, formerly Syriac, is then confused into 72 languages. Another Muslim historian of the 13th century, Abu al-Fida relates the same story, adding that the patriarch Eber (an ancestor of Abraham) was allowed to keep the original tongue, Hebrew in this case, because he would not partake in the building.

From Quran:
**028 - AL-QASAS (THE STORY, STORIES) **
28:38](http://www.wisemuslim.com/quran-section/41-quran-in-arabic/1580-028-al-qasas-the-story-stories-/#28:38)
Waqala firAAawnu ya ayyuha almalao ma AAalimtu lakum min ilahin ghayree faawqid lee ya hamanu AAala altteeni faijAAal lee sarhan laAAallee attaliAAu ila ilahi moosa wainnee laathunnuhu mina alkathibeena

YUSUFALI: Pharaoh said: “O Chiefs! no god do I know for you but myself: therefore, O Haman! light me a (kiln to bake bricks) out of clay, and build me a lofty palace, that I may mount up to the god of Moses: but as far as I am concerned, I think (Moses) is a liar!”

040 - AL-GHAFIR, AL-MU’MIN (THE FORGIVER (GOD))
40:36-37
:36](http://www.wisemuslim.com/quran-section/41-quran-in-arabic/1592-040-al-ghafir-al-mumin-the-forgiver-god-/#40:36)
Waqala firAAawnu ya hamanu ibni lee sarhan laAAallee ablughu alasbaba
**YUSUFALI: Pharaoh said: "O Haman! Build me a lofty palace, that I may attain the ways and means- **

:37](http://www.wisemuslim.com/quran-section/41-quran-in-arabic/1592-040-al-ghafir-al-mumin-the-forgiver-god-/#40:37)
Asbaba alssamawati faattaliAAa ila ilahi moosa wainnee laathunnuhu kathiban wakathalika zuyyina lifirAAawna sooo AAamalihi wasudda AAani alssabeeli wama kaydu firAAawna illa fee tababin
**YUSUFALI: “The ways and means of (reaching) the heavens, and that I may mount up to the god of Moses: But as far as I am concerned, I think (Moses) is a liar!” Thus was made alluring, in Pharaoh’s eyes, the evil of his deeds, and he was hindered from the Path; and the plot of Pharaoh led to nothing but perdition (for him).

002 - Surah Albaqara (The Cow)****
002.102** WaittabaAAoo ma tatloo alshshayateenu AAala mulki sulaymana wama kafara sulaymanu walakinna alshshayateena kafaroo yuAAallimoona alnnasa alssihra wama onzila AAala almalakayni bibabila haroota wamaroota wama yuAAallimani min ahadin hatta yaqoola innama nahnu fitnatun fala takfur fayataAAallamoona minhuma ma yufarriqoona bihi bayna almari wazawjihi wama hum bidarreena bihi min ahadin illa biithni Allahi wayataAAallamoona ma yadurruhum wala yanfaAAuhum walaqad AAalimoo lamani ishtarahu ma lahu fee alakhirati min khalaqin walabisa ma sharaw bihi anfusahum law kanoo yaAAlamoona

YUSUFALI: They followed what the evil ones gave out (falsely) against the power of Solomon: the blasphemers Were, not Solomon, but the evil ones, teaching men Magic, and such things as came down at babylon to the angels Harut and Marut. But neither of these taught anyone (Such things) without saying: “We are only for trial; so do not blaspheme.” They learned from them the means to sow discord between man and wife. But they could not thus harm anyone except by Allah’s permission. And they learned what harmed them, not what profited them. And they knew that the buyers of (magic) would have no share in the happiness of the Hereafter. And vile was the price for which they did sell their souls, if they but knew!