This divide will be there forever. No need to make everything equal whilst ignoring all the things a people is influenced by: religion, history, ethnicity, culture...
Equality cannot be achieved by force. Hindus and Muslims are two distinct (maybe the most distinct) entities, we don’t have much in common - this is not a bad thing per se - the only way to coexist is non-interference. Muslims do their stuff and are not bothered and Hindus do theirs. Nobody is insulted, nobody has the right to enforce his religious laws to the other party.
Can't say if the divide will be there forever but it sure has been here forever.
You kind of missed the point though so let me try and run it by you again.
Practically
nothing will change for the muslims on the ground in terms of how they wish to live and resolve their personal matter disputes (for serious crimes the law is the same for everyone already)
However, even in case of personal disputes (not including murder etc of course as already stated) there can be times when a molvi or a council of molvis (not exactly sure how it works) the islamic authorities may rule very unfairly, even in matters which would not be considered at par with murder etc generally and left to them to sort it out.. now that is a loophole which keeps the state from stepping in and delivering JUSTICE.
So in the rare instance that happens, people who have been hurt by said unfair ruling by a sharia council, will then have the option to approach the courts, who will do the right thing, and, if needed, overrule the mullahs verdict.
This holds true for xtian inheritance and Hindu undivided family laws as well (mostly to do with inheritance fights within families)
From what I know, muslims are many times quick to ostracize people from within their families and communities for a variety of reasons, sometimes very unfair reasons. The Indian legal system should provide protection to the vulnerable from all communities.
The state is not going to be outlawing Islam or banning beards for young men and burkas/niqabs for women or anything of the sort.
We have a very broken bad secularism here, we're upgrading it.
That's all it is.