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Nobody knows. If you figure it out then you will be world famous.
Although Hinduism cannot be attributed to one specific person, it is the oldest and extant religion that dates back to before 6500 B.C. However, there is no exact date for its origin or formation.
If by headquarters you mean place of origin. Than that would be kashi situated in India.
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There is no known date when Hinduism began. We have artifacts of Hindu origin that are about 28,500 years old so Hinduism began in at least 30,500 years ago, but it probably began before that.
That is enveloped in hoary mythology. What is now Hinduism may have started at the time when humans first came to India from Africa, 60,000 years ago. It must have changed a thousand times, but there is no reason to suppose a break.
Hinduism, but the caste system did not have it's origin in Hinduism, but was put in place in India, and still affects people in bad ways today.
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th origin of Hinduism is Lord Brahma himself. Hinduism 4 vedas are the most holy scriptures of hinduism. there after mahabharata and ramayan bhagwat geeta are important. after that puranas upnishada are sacred.