Orthodox Muslim religious scholars are still living in medieval times in India.
For example in India - Muslim man can marry up to 4 wives. The law allows only for Muslim man. It is illegal for everyone else like Christians, Buddhists, Sikhs, and Hindus. Polygamy (polyandry to be more specific) is legally allowed for Muslims only, as Islamic scholars claim everything done by Muslim Prophet Mohammed should be allowed.
Some Islamic Religious groups do not want any reform, as they are afraid of losing their power.
Modi is trying to reform this outdated behavior.
Muslim women see Modi as their savior.
All male self-selected Muslim religious leaders are waging a vicious campaign to keep their power.
https://www.bbc.com/news/world-asia-india-61351784
In India, the issue is a political hot potato. Prime Minister Narendra Modi's Hindu nationalist Bharatiya Janata Party (BJP) has promised to enact a Uniform Civil Code (UCC) - a contentious piece of legislation that will mean marriages, divorces and inheritance will no longer be governed by their religious law but will come under a common law applicable to all citizens.
And at a time when the country is highly polarised along religious lines, any reform suggested by the government is bound to be considered an onslaught on Islam by a majority of Muslims.
https://www.bbc.com/news/world-asia-india-61351784