With re: Vedic religion. The Aryans started with Indra worship. In fact, Rig Veda calls Krishna an asur leader of the dark hordes.
Book 8, Hymn 96 :
Verse 13: “An Asur called Krishna lived on the banks of river Anshumati. He moved fast and travelled along with ten thousand armies. Indra located that shouting Asur using his intelligence and in the interest of humanity, destroyed his murderous armies.”
Verse 14: “Indra said, I have seen the Krishna Asur who roams around the caves on the banks of river Anshumati. He is stationed in water like the shining sun. O’ Maruts, the fulfiller of wishes, I want you for the battle, you kill him in battle.”
Verse 15: “Fast-moving Krishna Asur lived on the banks of river Anshumati. He was shining. Indra slew the black, invading armies with the help of Vrihaspati.”
Verse 17: “O’ wielder of the bolt, Indra, you have done this. As a matchless warrior, you destroyed the power of Krishna using your bolt. With your weapons, for the welfare of the people, you killed Krishna Asur by lowering your face and you obtained cows from the enemy using your power.”
Subsequently, when the invaders/migrants interbred with the original inhabitants, they started adopting the traditions and practices. 
So to say Vedic religion is being imposed would be inaccurate when neither Vishnu worship nor Shiva worship came from the Aryans.
But Aryanization is certainly there. 
Krishna might have looked like this:

But he is portrayed by fair-skinned Farex babies:

Edited by HearMeRoar - 3 years ago