[1] This was the first organised casteless movement in British India and reverberated from its heart of Bengal to Assam, Bombay State (Maharashtra and Gujarat), Punjab and Madras, Hyderabad, and Bangalore.
"Mobility" i.e. leaving the home and being exposed to external influence meant loss of caste for Brahmins (a social device to conserve meagre land holdings and priestly incomes).
As a consequence ghastly social evils like Sati (or the burning alive of Hindu widows) were encouraged, primarily by the fixed priestly class.
The mobile clan members banded into associations (Sabhas) to oppose these un-Brahmic practices colliding head on with orthodox Hindu society in Bengal.
The founders of this Brahmo religion were foremost reformers for nationalism, equality, secularism and education which now stand enshrined in the Constitution of India as Fundamental Rights.
For their associations with the Rulers of the times, they were ostracised and barred from orthodox Hindu society but were amply compensated by "being so weighed down in honours by the British that they forgot all the radicalism of their youth."
It was Dwarkanath Tagore alone who could publicly lambast an English Magistrate Abercrombie Dick on the emergence of servile mai-baap (great lord) ruling culture of 19th-century Bengal as follows: ...
The first major success of this Zamindari Sabha was arraigning the East India Company forces against Titumir a Muslim extortionist of Zamindar's (landlords who perpetuated a system of feudalism with the support of the British), at Nadia in November 1831.
By the 1830 Trust Deed of Brahmo Sabha principles it was held that all men are equal and without distinction and there is no need for priests or formal places for worship etc.
By the 1848 Adi Brahma Dharma published doctrine of Debendranath Tagore, it was held that present Hinduism doctrine is corrupted, but that the original Vedas of pre-Aryan times (being relatively pure, though still fallible and not Scripture to be relied on) as reflected by 11 judiciously chosen Upanishads also speak of a single formless God who requires no temple or priest or idol for worship, only a rational and pure conscience of an intelligent mind.
This publication resulted in the famous "Removal of Caste Disabilities Act" of August 1850, and Brahmos were free to establish their own religion and marry amongst themselves without fear of disinheritance from ancestral property.
In 1871 the expelled group petitioned the Government to recognise them and their inter-faith marriages claiming that Brahmos are not Hindu, Christian, Moslem, Jew or Parsi etc..
A famous Sikh gentleman Sirdar Dayal Singh Majithia from the priestly family of this temple joined the Adi Dharma and subsequently contributed much money to the faith and also became a founder Trustee of the Sadharan Brahmo Samaj in 1880.
Despite this difference of opinion, however, it seems that the members of the Brahmo Samaj and Swami Dayanand parted on good terms, the former having publicly praised the latter's visit to Calcutta in several journals and the latter having taken inspiration from the former's activity in the social sphere.
Another close associate of Debendranath Tagore, Lala Hardayal volunteered to promote the Adi Dharma cause in the Central Provinces and Punjab.
He linked up with Sirdar Dayal Singh Majithia and the pure Adi Dharma message of One God without Caste or Priests took great root in this Province.
He bitterly opposed immoral (i.e. polygamy and child marriage) practices of the upper classes of Telangana starting a new phase of reform for Adi Dharma in Telugu speaking regions.
Kandukuri vacillated between Adi Dharm nationalism and Keshab Sen's dictum of "Loyalty to Sovereign" being rewarded with Rao Bahadur title in 1893 by British.
But by clinging to Keshab Sen philosophy of "Loyalty to Sovereign" till 1907, Viresalingam found himself increasingly isolated from the militant ideology of Adi Dharma's new stridently nationalistic adherents in the region.
In 1878 these expelled neo-Christian members split again, but almost all of them recanted (by having executed a Trust Deed of Sadharan Brahmo Samaj in 1880 virtually identical in Principles to the 1830 Adi Dharma Trust Deed) and were reabsorbed into Brahmoism by Maharshi Debendranath and Rajnarayan Basu the founders of Hindutva (i.e. Brahmoism's nationalistic religion of Adi Dharma of pre-Aryan uncorrupt times means all Indians are one without distinction, regionalism and caste[citation needed]) as Sadharan Brahmo Samaj.
In 1897 a landmark decision of the High Court of the Punjab in Sirdar Dayal Singh's case after his demise, upholds that Brahmoism is a separate religion from Hinduism (except for the Adi Brahmos – Adi Dharmis who remain within Hinduism), whereas simultaneously affirming such gems as "... Sikhs are Hindus and nothing but Hindus..." and "A Sikh (Sardar Dyal Singh) who follows Brahmoism without actually converting to it continues to remain a Hindu."
To spread reform among the backward people of Punjab he published various newspapers in Punjabi, Urdu and Hindi and the highly controversial "Widow Remarriage Advertiser" in English.
As a result, many Sikhs also joined Adi Dharm in large numbers relying on the Mulmantra of Sikhism i.e. Japuji Sahib which begins as Ik Onkar Sat Naam Karta Purakh translated as "There is only one God His name is Truth He is the Creator.." In 1900 the Government passed the Land Alienation Act.
From 1922 onwards, dissension in Arya Samaj factions of Punjab between the Vasant Rai and Mangoo Ram groups again split the regional Adi Dharma movement.
The major controversy at this time concerned many depressed caste Sikhs of Chamar grade in a supposedly casteless Sikhism rediscovered Ravidass's teachings of the 14th century (claimed by them to be incorporated in Guru Granth Sahib) and got themselves registered as Adi -Dharmi's in the 1921 and 1931 Census of Punjab after the legal decision in Bhagwan Koer's case and the Pirali precedent.
With a few deaths of such converts often from very rich families or landed gentry, property disputes began reaching the Courts and the existing laws proved inadequate.
The elders (including Rabindranath Tagore) of Brahmo Samaj at Shantiniketan, Delhi and Allahabad were consulted (by M. K. Gandhi) and who after considerable disagreement advised instead that the long pending Marriage Validity law for converted low caste Arya Samajis be enacted, which was speedily done in 1939 by an obliging British Government, enabling the loving couple to be wed in early 1942 by secret pre-Vedic Adi Dharm reformed Brahmic rites taught to Nehru's priest by Adi Dharma elders at Allahabad in the presence of Brahmos like Sarojini Naidu with the groom wearing a sacred Brahmic thread in secret.
In 1916 the Indian Civil Services Ethnography Administration Surveyor R. V. Russell examines in detail and publishes that Brahmo Samaj is indeed a religion (and differentiates it from "sects").