Of the religions that developed in the Indic hearth, the oldest is probably:

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Hinduism is widely considered to be the oldest of the Indic religions, with roots tracing back to the ancient Indus Valley Civilization in the 3rd millennium BCE. While the precise origins of Hinduism are complex and debated, it is generally accepted that the tradition evolved over centuries of interaction and synthesis between various indigenous and Aryan cultures in the Indian subcontinent. Buddhism, Sikhism, and Islam are all younger religions that emerged in India between the 6th and 15th centuries CE, with Islam arriving from outside the region. Protestant Christianity is not an Indic religion.

Of the Religions That Developed in the Indic Hearth, the Oldest