A long time ago I had to do a critique of a book by a muslim assames politician active at partition. His entire point was that the native assamese did not have confidence in the hindu majority, and they felt they would be better treated in Pakistan. It was a long time ago, but my understanding was that there were three distinct parties; hindu, muslim and the native assamese. This politician felt that assam could have become part of pakistan.
Wow. what a knowledge. "Native assamese". Dear friend the Native assamese are Hindus since the day of landing of the Aryans in its land. they were Hindus by skin and nerves.
They were hindus centuries before you or I might have been converted to Islam by the invaders. Dear friend, There are aAssamese Hindu warriors who faught in Mahabharata. They belonged to Varmanas of Kamrup(ancient assam) 350 AD. One of the 18 purans of Hinduisim, the Kalika Puran was written by native assamese in Assam.
If you are talking about the Bodo people who are also among the early settlers, they were not practicing in any religion in ancient times. They worshiped their forefathers. But bodos were happy to have taken up hinduisim without anyone converting them . There are no Bodo muslims now.
So I dont know which native assamese you are mentioning.
If you are talking about the ones and fews who were converted during Mughal onslaughts they are happy to be in assam and assamese welcome them.
Islam is the newest religion in assam and people are tolerant to any religion.
There are no religious conflicts in assam in the name of religion.
But yes there are conflicts between the immigrants and the native assamese, because the immigrants have to be digested due to political support. Else the assamese would not like to see their face even for a single day.
So please don't read books by only muslim seperatist during Bangladesh creation. They will write anything and everything not real.
Visit assam and see for yourself , you can count the number of assamese speaking muslims(natives). But you will not be able to count the Non assamese speaking muslims (immigrants) as they are in millions now.