Dibya Raj dude There is absolutely no doubt that no person can become a Hindu or a Christian or a Buddhist or a Muslim etc by birth. Did you know why cow is worshipped in Hinduism when you were at the age of 1 without your parents or anyone telling you. If you dont knew why, then it a strong evidence that you were not Hindu by birth. If I were to believe your notion of "one can become hindu only by birth" then you are NOT Hindu at all because to become a Hindu by birth you have to be born in this world with a full knowledge of total Hindu idealogy, all customs and practices of Hindusim..isn't it ?