Mr.Ramasubbu, from where on earth you got the information that "thousands of dravids were murdered by Shankaracharya during 800 a.d" The Shankaracharya (Adi) was himself a Dravidian born at Kaladi in Kerala. Can you give some authentic source of information for the crime alleged to have been committed by him? Is is this an imagination of some dalit movements backed by Christian missionaries?
Indian constitution recognizes all Indians except Muslims, Christians, Jews and Parsis as Hindus. Any amount of rambling by people like you is not going to change the ground reality. If you are dis-satisfied with your religion (appears to he hindu from your name) you are most welcome to adopt any religion of your choice. Our Constitution guarantees that freedom also!