Even if someone's claim that castes exist among Muslims in North India is accepted, that is a story of North India's ignorance. It is not the story of Islam and Muslims.
All of that arose from ignorance and from the Indian caste system being carried over wholesale.
There is no caste or casteism in Islam, and none among Muslims who believe in and follow Islam.
In any case, it is something everyone clearly knows, or can know, that there is no caste or casteism in Islam or among Muslims.
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Note the very phrase "among Muslims in India."
In India...
In a place full of filth, that filth will creep into everyone there unless they stay vigilant.
It is just like the smell of fish clinging to someone who has gone to a fish market. It is the influence the surroundings have.
The filth of birth and lineage pride and hierarchy has crept in that way and exists among Indian Muslims.
But that hierarchical, caste-based filth is not in the articles of faith of Islam, and does not belong to it.
The Hindu belief in past-life sin and merit.
The belief that each person's birth is determined by the sins and merits of a previous life.
The belief that each person's birth is nothing but a rebirth resulting from past-life sins and merits (a belief said to be Hinduism's).
The Chaturvarnya (four-varna) belief, endorsed by everything from the Manusmriti to the Puranas and the Vedas.
This created hierarchical, caste-based filth among those in India who have recently come to be called Hindus.
This made those recently called Hindus feel no pain at all in enforcing hierarchical, caste-based filth.
Islam, which does not contribute such a belief in past-life sin, merit and rebirth, did not create hierarchy on that basis among Muslims.
Instead, Islam brought only this: all human beings are equal, alike before one God.
That means that in the lives and world of those who became Muslims by believing in and following Islam, there is no caste or caste-based hierarchy stamped on a person by birth, and there never will be.
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If the governments of India decide that there are castes among Indian Muslims, will there then be caste in Islam? Can it be said that Islam has a caste system?
Isn't the basis of Islam only Islam itself, only the Quran and the example shown by the Prophet Muhammad?
The basis of Islam is not the Indian government and government records, is it?
The castes among Muslims determined by the government are not castes that Islam permits or prescribes.
Islamically, there is only one human being, one earth, one God and one system.

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