Why Rangeela Rasool was banned in India?

The book was considered highly controversial due to its satire of the marital life of the Islamic prophet Muhammad. Its publication led to reforms in India's penal code that made blasphemy illegal and may have contributed to promoting the partition of India. 

In the decade of 1920, the British experienced episodes of violence between the Muslim and Hindu communities. Between 1921 and 1922 there was the Malabar rebellion, also known as the Mappila rebellion, as the Malabar Muslims are known.

The Muslims of Malabar not only rebelled against the British authorities but also against the Hindu elites of the area who suffered from massacres and forced conversions at the hands of the Mappilas.

Between April and September 1927 there were at least 25 spread across Mumbai, Punjab, Bengal, Bihar, Odisha, and other regions, leaving a balance of just over a hundred dead and just over a thousand injured.

In the Punjab region, these hostilities were accompanied by texts published by members of a religious community to criticize or offend other religious communities.

Rangila Rasul was published by members of the Hindu community in response to a titled 'Sitka China' which was published by the members of the Muslim community and depicted the Hindu goddess Sita (wife of Rama, the hero of the Ramayana) as a prostitute.

And this was the reason why this book was banned in India.