Hindu practice had no discontinuous break from the past - barring greater democratization - an inevitable outcome of urbanization and modernity
Even that materialized not as much in 19th century but in the 20th century
But in terms of the nature of ritual on the ground, or the forms of religious practice, there was hardly much attenuation or change
And saw the emergence of new sects, new theologians, with altogether new doctrines
Puritanism
Calvinism
Lutheranism
....
Later Methodism
Mormonism
Not to mention the Counter-reformation movements like Jesuits
Sure we had -
Brahma Samaj
Arya Samaj
Later Ramakrishna Mission..
But they carry very little weight or popular support today with the sole exception of Arya Samaj to a limited extent in North West India
But sects that go way back in time - in many cases over 1000 years
Be it the Smarthas of Shankara MaThas (8th cen)
Sri-Vaishnavas (12th cen)
Madhvas (13th cen)
Be it the Shruti texts, Brahma Sutras, Bhagavad Gita, the ItihAsas, PuraNas
Or for that matter the major Tantra / Agama texts which remain influential in South Indian temple procedurals
But with all due respect to Vivekananda, his appeal remains in large measure among the yuppie Hindu middle classes
At least relative to the traditional acharyas
The two most commonly recited compositions by devotees in India are
Hanuman Chalisa (16th cen)
Vishnu Sahasranama (about 2000 years old)
Both have youtube hits in tens of millions
Sure. A handful do, in every town I am sure
But it's a rare thing
The most famous one being the King James Bible from early 17th century
Even the vernacular religious texts have considerable antiquity
But there are other vernacular traditions that are much older
E.g. The Azhwar Pasurams recited in Old Tamil by Sri-Vaishnavas dates conservatively to 8th/9th cen CE
The Agama-governed practices are not of 19th century provenance
But even by the most conservative estimates are at the very least several hundred years old if not more
The texts are at least 1000-1500 years old. But that's me. Most traditionalists would argue they are much much older than that
The point one is making is - it is simply wrong to equate the "reformation" in Christianity circa 16th century with the so-called "reform" in Hinduism
But merely an adjustment to the realities of modernity
In contrast, Christianity DID have a "reformation" which altered the religion. Fundamentally
But is a branch of the much older GauDiya Vaishnava movement from the 15th century
All one is saying is - Hinduism today in large measure is NOT a new 19th century makeover religion
They may have a point
While others may say "reform" has gone too far
There was much "social reform" in 19th/20th centuries but the religion itself was not re-made or radically tinkered with