Hinduism is the oldest extant religion.
>>> Hinduism is the oldest extant religion.
That's also not quite true. Hinduism as we have it today is not the same as it was in like 2000 BCE. It had been mixed of several different indian cultures throughout the centuries. Depending on how Zoroastrianism has developed Zoroastrianism could very well be the oldest religion still in practice.
But it's acceptable to say hinduism is the oldest existing religion sure