As an outsider and one who has not read any hindu religious text, it seems to me hinduism in reality is a conglomerate of various beliefs, cultural traditions, teachers, teachings, deities and so on. Bound by loose similarity in some traits, and strong similarities in other cases.
But i might be wrong.
Lets take the example of Middle East where there is varoius religions like Islam, Christianity, Judaic. But also huge number of smaller less well known religions Alawites, Bahai, Mandaeism, Yazidi and Zoroastrianism.
They all have some similarities and yet are not the same. Some denominations have loose similarities while other have strong similarities.
I suspect we should characterize even Buddhism and Hinduistic beliefs under more approperiate name like Bharatism, Indianism or something like that. Even though it may sound like name of a nationalistic ideology than a religion.
Maybe the religions in middle-east in similar fashion can be meshed together adademically too and be named something like Nileoxusism…but in Islam its just called People of the Book.
Maybe indians also have a similar concept?
Anyway, the religions in both of these cultural regions would be better understood as interconnected web of traits, stories, characters, interpretations and ethics, that somehow still fit into the whole as one unit.