Bangladesh has an literacy rate of less than 60%. Rest 40% read some language or other. So 90% is ....
Meantime please go through the link (from he Dhaka University Studies) below:-
academia.edu/3788700/Language_Situation_in_Bangladesh
Page 8 Trend of Foreign Language Use in Various Social Settings: religious and educational
"There are, however, some situations where either people use or require using a second language for their special purposes in some extraordinary social settings including educational, religious and official ones. For example, they use
any of the language of Arabic, Sanskrit or Pali for their religious purposes and English or Urdu/Arabic for their educational purposes. Though they use one of these languages as a second language in various social settings, they donot have an equal level of proficiency in these languages.
In the educational setting, a section of the people use English or Urdu/Arabic language for the purpose of attaining an education. Although the common people of the country receive education given through Bangla medium,there are other sections of people who receive education through English or Urdu/Arabic medium. The people of the elite community prefer to receive a Western education through English medium in the English medium institutions.Again, there are many Muslims, who bear fundamental values of Islam, feel satisfied to receive ‘pure’ educationthrough the mixed media of Urdu and Arabic in Madrasha. The people being educated in the special institutions would use their mother tongue Bangla in common social settings, and English and Urdu/Arabic in their educational ones.Through the process of being educated in the media in English or Urdu/Arabic, only some of them can attain a certaindegree of control over these languages. These people often switch from one code (English or Urdu/Arabic) to another (Bangla) and vice versa in the educational settings.
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Finally, its heart breaking to see people from a country which got independence for language movement, the movement date refered by UNESCO as world language date wants to change it since it is not that Islamic.
As per my knowledge Islam has nothing to do with language, I know a guy who teaches Sanskrit in a College in West Bengal (he was 1class 1st in MA from CU) and is a muslim, doing 5 namaz a day, even going for Haz.