-- you have everything from highly abstract conceptions of the Brahman all the way to Shinto-like worship of individual deities --- and everything in between. It's highly heterogeneous, and what else could you expect in a nation so large and populous and historically and geographically diverse?
The beauty in diversity is the essence of a fruitful living on earth. That goes as much for humans as it is for animals, i think.
The point here, i suppose is not what else could one expect, but that of a sense of excitement while wanting to celebrate this extraordinary accomplishment of acheiving unity in spite of the diversity. Lets compare. The diversity which we see is no way different to the diversity of culture, language, ethnicity which we see in the European continent. But we see, and history recorsd that Europe was and is divided at several fronts. Yes the Euro is, admittedly a good example of monetary unity, but nothing else.
Strangely, however, In India, even after the invasions of muslim and christian groups, having a completely diffrent view-point of life and its intracacies, the integrity of the nation remains as one single entity, if we leave aside the 1947 historical events as an exception.
The beauty of the religion is one of the factors of acheiving this kind of nationhood. More than the attraction for one's land, language, economic policies, ethnicity, culture or religion itslef, it is the liberal and democratic way of life, garbed in religious customs and rituals which, according to me is the cause of the strong belief in remaining an Hindu.
To become an Hindu, Hinduism does not impose any restrictions or rules or norms that need to be followed. Yes, the caste system imposed a social barrier, but no Hindu is forced to go to a temple, as the case is otherwise for a catholic child.
The religion is also rich in its accumulated wealth of knowldge while tackling metaphysical, physical, social, and medical systems of knowledge.
The combined knowledge systems may at first appear as incoherent, if one is only reading scriptures and myths like Mahabharata & Ramayana.
(Like gospels and parable's, these myths were designed to appeal to the common masses while diseminating the core understandings and philosphical theories in the best possible manner. Like any comunication expert and or an educationist would say, stories are the best way to communicate an idea or a moral.)
However, if one is able to decipher the Upanishads, The Geeta, The Advaita principles, and of course the four Vedas and their intrepretations, one may be able to understand the principle of life. If this understanding is acheived much of the intellectual struggle to understand life will be solved to a great extent.
In the case of Hinduism, it provides a vast system of knowldge that can be the basis for pursuing the quest for a full understanding. And the beauty is, that any person, irrespective of caste, religion, gender, age, qualification can pursue this knowldge system or philosophies by self motivation or under someone/gurus tutorship.
It allows and gives space to a vast and varied discipline's to be debated and discussed in an open and free intellectual environment. In other words a suitable environment for heterogenuity in the thought processes, - can be called as a range of intellectual ability.
There is no rigidity in the thought processes as one encounters in other religions for example in the Abrahamic religions where the notions are streamlined, and some allowance for stray thoughts are given, but no one is allowed to think from an completely different or opposite view-point or perspective.
Therefore the beauty of Hinduism lies in its essence, however contradictory and incoherent the outside structure appears to an outsider.
So, acheiving the impossible is above expectation and thats what we need to celebrate.