In a nutshell, Hindus believe that they belong to a family which associates itself with a particular caste identity.
Apart from this, no Hindu is really, rightly or wrongly, concerned about what other Hindus believe. EACH HINDU HAS HER/HIS OWN SET OF BELIEFS.
[Following excerpts are taken from the book ‘Annihilation of caste’, originally meant to be a speach by Dr Ambedkar, the most famous scholar of comparative religious studies]
The first and foremost thing that must be recognized is that Hindu Society is a myth. The name Hindu is itself a foreign name. It was given by the Mohammedans to the natives for the purpose of distinguishing themselves [from them]. It does not occur in any Sanskrit work prior to the Mohammedan invasion. They did not feel the necessity of a common name, because they had no conception of their having constituted a community.
Hindu Society as such does not exist. It is only a collection of castes.
Each caste is conscious of its existence. Its survival is the be-all and end-all of its existence. Castes do not even form a federation.
A caste has no feeling that it is affiliated to other castes, except when there is a Hindu-Muslim riot. On all other occasions each caste endeavours to segregate itself and to distinguish itself from other castes.
This anti-social spirit, this spirit of protecting its own interests, is as much a marked feature of the different castes in their isolation from one another as it is of nations in their isolation. The Brahmin’s primary concern is to protect “his interest” against those of the non-Brahmins; and the non-Brahmins’ primary concern is to protect their interests against those of the Brahmins. The Hindus, therefore, are not merely an assortment of castes, but are so many warring groups, each living for itself and for its selfish ideal.”
The Hindus criticise the Mahomedans for having spread their religion by the use of the sword. They also ridicule Christianity on the score of the Inquisition. But really speaking, who is better and more worthy of our respect—the Mahomedans and Christians who attempted to thrust down the throats of unwilling persons what they regarded as necessary for their salvation, or the Hindu who would not spread the light, who would endeavour to keep others in darkness, who would not consent to share his intellectual and social inheritance with those who are ready and willing to make it a part of their own make-up?
I have no hesitation in saying that if the Mahomedan has been cruel, the Hindu has been mean; and meanness is worse than cruelty.”
~Dr. B. R. Ambedkar