speak english fluently

Cause nowadays english are speacked in many countries

Cause means a Reason or Motive.In the context which you used it makes it more of a slang that the direct meaning of the word.So the correction I want to speak English Fluently because  it is spoken in many or you can as well say Most Cuntries because it has a huge poulation of the world that speaks English and French/Spanish is the 2nd.