Many people in india say it is a hoax created to divide india between north [fair skinned , upper caste ] and South India [ darker skinned , lower caste ]. While some say rig veda and other vedas have come from Zoroastrianism through indo aryan invasion , but in fact hinduism is older than Zoroastrianism. If you want more info you can see abhijit Chada YouTube video on indo aryan hoax .