My thick skull is there to protect a very fine brain (nowadays rare in Bangladesh) that is very capable of identifying and rejecting fallacious arguments. In 1905 Carzon didn't came up with a plan to divide Bengal just out of thin air, Muslims of Bengal asked for it and supported it, that's why.
Later the Muslims of Bengal were THE-MOST-PROFOUND-SUPPORTERS-OF-PAKISTAN. East Pakistanis aka Bangladeshis wanted a separate country "Pakistan" much more than the West Pakistanis aka Pakistanis. The campaign for creation a separate Muslim country were MADE bloody and genocidal BY THE East Pakistani aka Bangladeshis through a supposedly state-sponsored riot by the sitting Muslim PM of the province of Bengal. That guy was one of the strongest and most vocal supporters of partition and creation of Pakistan, and his sudden proposal of a separate country of Bengal was nothing but a ploy to increase "Muslim land", if that had happened, then the Hindu Bengalis and other minorities of those regions would have faced the same fate that the Hindu Bengalis and other minorities of Bangladesh have faced and still (the leftovers) are facing......here nothing is left to assumptions.
Bangladeshis use lots of Arabic words and cultural aspects, the large groups of Haj parties from rural Bangladesh in the international terminal of the Kolkata airport shows that they also follow their dressing styles. But that's not the most important part of it, the most important part is the
hate-filled, genocidal treatment to the religious minorities that Bangladeshis-claiming-to-be-Bengalis learned from the land of Arabia. Do read about the treatment of religious minorities like Jews, Yezidis, etc. in the land of Arabia, you will find a lot of similarities and the same pattern in the treatment of religious minorities like Hindu Bengalis and other minorities of Bangladesh with that.
You will find lots of material and books on the treatment of religious minorities in the land of Arabia, for now you read about the treatment of Jews in Iraq (considering that 'Karma' seems to be in full swing in Iraq), it's a long but good article:
http://www.timesofisrael.com/the-expulsion-that-backfired-when-iraq-kicked-out-its-jews/
There is nothing wrong to be a "Practicing Muslims", but there is everything wrong to be a "Political Muslim", and an "Intolerant Muslim"....and that's where the problem begins...for the minorities as well as the Muslims themselves...almost everywhere in the world...including Bangladesh.