The Kurgan people had to originate in Central Asia. - Bernard Sergen

One of the paradoxes of India is its astonishing linguistic diversity (they speak about five hundred languages there) compared with its cultural unity.

Shiva, Varuna, Yama, Durga-Parvati, we already said it, are deities of IE origin, the rituals concerning fire, soma and the person of the king are equally of IE if not Indo-Iranian origin. But it is now obvious that the Indo-Aryans, upon arriving in India, have amply harvested the Harappan heritage and included its ritual customs (construction of hearth-altars, rites inside buildings, use of the stellar vestment, ritual baths, fixation of feasts on the stellar equinoxes…) in their own religion.

Indeed, from the Indus eastwards, we lose track of this Bactrian invasion. Sergent himself admits as much: “For the sequel, archaeology offers little help. The diggings in India for the 2nd millennium BC reveal a large number of regional cultures, generally rather poor, and to decree what within them represents the Indo-Aryan or the indigenous contribution would be arbitrary. If Pirak (…) represents the start of Indian culture, there is in the present state of Indian archaeology no ‘post-Pirak’ except at Pirak itself, which lasted till the 7th century BC: the site remained, along with a few very nearby ones, isolated.” So, the Bactrian invaders who arrived through the Bolan pass and established themselves in and around the border town of Pirak, never crossed the Indus.