i dont want to go into that department, even though the notion of balochistan being the origin of farming in IVC or india has been totally debunked, there are sites like bhirrana etc which have been dated earlier than balochistan sites like mehrgarh.Look into Sarazm , consider the early archeology in Balochisatn is connected to the Iranian Plateau as well, that htere seems 'proto-Elemite' influence in early BMAC and that " Balochistan occupies the very southeastern-most portion of the Iranian Plateau, the setting for the earliest known farming settlements in the pre-Indus Valley Civilisation era " .
i dont wanna go into this because as i have already stated, the balochistan part was always under the indian influence, and the mehrgarh site has nothing to do with the iranian plateau to begin with, it forms part of the indus valley geographical area as well if you carefully look at the balochistn map.
secondly, farming began in india at isolated locations, three of them atleast have been identified, one in north india where rice was domesticated, one at IVC and one in southern india.
im not sure if you mean that BMAC precedes the IVC in form of agriculture, civilization, trade network etc, i have not come across such notion, if anything it is BMAC which comes later than IVC and not vise versa.
IVC is atleast dated between 3300-1300 BC, there maybe even further revision and push back as the archaeologists dig sites like mohenjo daro deeper and further back in time.The Bactria–Margiana Archaeological Complex (short BMAC), also known as the Oxus civilization, is the modern archaeological designation for a Bronze Age civilization of Central Asia, dated to c. 2400–1600 BC
Bactria–Margiana Archaeological Complex - Wikipedia
im not sure why are you refering to vedanta and not vedic religion?If I may 'speculate' as you did ; First, there was 'Aryan religion' , then 'divisions' arose and new cultures formed , moving to new locations and accretion and development took place . I am sure that the forms of 'Vedic religion' known today did originate in India . Thats why the Vedic texts match the IVC and the Zoroastrian ones match the BMAC ... as some say .
Unfortunately, although this 'early Aryan religion' is mentioned in Avesta , we have little knowledge actually about it , only reference to it.
vedic religion is a parent religion since zoroasterianism is an innovation and also doesnt preserve its old language form as it was corrupted and translated into pehlavi during sassanid periods, and zoroasterianism is a later innovation, and since geography of vedic texts indicate IVC area its highly probable that it went from IVC and got innovated in the form of zoroasterianism after following vedic religion for some periods. archaeology of the IVC and indian vedic history of gandharas and kambhojas do prove this notion. other evidences being the mittani indo aryan names. somply meaning vedic texts are dated earlier than avestan texts so in no way, avestan is referring to ''Aryan religion'' which predates the vedic one.