
“Who is the founder of Hinduism?” This is one of the most fundamental questions asked about Hinduism. It is so evident because all the other religions in this world have founders. E.g., Jesus Christ is the founder of Christianity, Hazrat Mohammad Paigambar is the founder of Islam, Gautam Buddha of Buddhism, and so on.
So, as Hinduism is a religion, there must be a founder. The answer to this question is that there is no single founder of Hinduism, as Hinduism was not founded as a religion.
It was a culture that flourished in India, which later took the form of a great religion. It would be easy to understand who founded Hinduism if you know what Hinduism actually is.
The modern form of Hinduism is actually a mixture of teachings from the Vedas, mainly, plus teachings of ancient Rishis and some great saints and regional customs and traditions. Hinduism changes with time without disturbing its basic teachings and different deities, which Hindus worship. But the Vedas are the main base of Hinduism.
Some of those great sages were the Saptarishis who founded the base of Hinduism. The Saptarishis keep changing for every Manvantara.

Many scholars believe that Lord Brahma is the founder of Hinduism because he created this universe and set the rules that are the basis of Sanatan Dharma, and Hinduism is its modern name.
Vedas are believed to have been imparted from God to human beings some thousands of years ago and were carried forward through the teacher-disciple tradition (Guru-Shishya Parampara). So, as God created the Vedas, we can say that God is the founder of Hinduism, which he updates from time to time by incarnating on the Earth.
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