[…]folklore and fairy tales in modern Indo-European societies have been proven to go back thousands of year to a common source and thus are a potential source of recreating Proto-Indo-European mythology. In the same way that different words in different Indo-European languages can be traced back to a common PIE stem, different stories and myths (such as the Cosmogenic Myth) can be traced back to a common legend among the early Proto-Indo-Europeans. […]

But apart from these deeper, more hidden traces of PIE religion in Western societies, there is a more comprehensive one found in the east: Hinduism. […] Hinduism […] although it has been in fact influenced by the ancient Vedic Religion, practiced by the first Indo-Europeans to arrive on the Indian Subcontinent, to a very large degree.

What is Hinduism?

If one is to ask the question what Hinduism is the answer is a lot more complicated than one might expect. In the Western World we have a pretty clear picture as to what a religion is and what elements comprise it. This is due to the fact that Christianity as the most dominant religion in Europe – and thus in many of its former colonies as well – is organised systematically, such as in the aforementioned Roman-Catholic Church, which in turn organizes religion and religious practices for all of its followers. So there is a hierarchical top down system, with the Pope at it’s head, through which information in regards to how to practice Catholic faith trickles down to priests of all ranks and through them to the Catholic believers all around the world. In addition to this there is only one holy scripture, the bible, which gives answers to all of life’s questions, from the most trivial to the most fundamental. So even though there are multiple different Christian Churches which put emphasis on slightly different aspects of the faith, there is a very large degree of overlap due to the fact that they are all based on one book and the teachings and philosophies of Jesus Christ.

In Hinduism, on the contrary, there is no centralized body, organization or system, which regulates the average Hindus belief. And thus it has been proposed that Hinduism itself can’t be considered a religion at all, but rather many different but related belief systems which have interacted with and borrowed elements from each other over millennia[…]

Hinduism – The last Indo-European Religion (?) — European Origins