Dr B R Ambedkar, Dalit icon and architect of Indian Constitution was a personality whose writings are used by all kinds of people to highlight their points. The Marxist Left in India use them to fight Hindutva Right, the non Marxist Left and the centrist Congress use them to fight the Hindutva and the Communists, the Hindutva Right use it to attack Islam and the Dalits try to use them for their own survival.
So what did Ambedkar write about Islam ?
In his book Pakistan Or The Partition Of India, a collection of his writings and speeches, published in 1940 Ambedkar wrote :
Hinduism is said to divide people and in contrast Islam is said to bind people together. This is only a half truth. For Islam divides as inexorably as it binds. Islam is a close corporation and the distinction that it makes between Muslims and non-Muslims is a very real, very positive and very alienating distinction. The brotherhood of Islam is not the universal brotherhood of man. It is brotherhood of Muslims for Muslims only. There is a fraternity, but its benefit is confined to those within that corporation. For those who are outside the corporation, there is nothing but contempt and enmity. The second defect of Islam is that it is a system of social self-government and is incompatible with local self-government, because the allegiance of a Muslim does not rest on his domicile in the country which is his but on the faith to which he belongs. To the Muslim ibi bene ibi patria is unthinkable. Wherever there is the rule of Islam, there is his own country. In other words, Islam can never allow a true Muslim to adopt India as his motherland and regard a Hindu as his kith and kin.