>>9508435Vedic religion, also called Vedism is the religion of the ancient Indo-European-speaking peoples who entered India about 1500 bce from the region of present-day Iran.
The Vedic religious beliefs include elements of various Indo-European faiths (Celtic, Nordic, Slavic, Greek etc.).
>https://www.britannica.com/topic/Vedic-religionIt's the second oldest religion, right after Sumerian religion (which has the same Proto-Indo-European roots).