The parents note down the time of the birth, place of birth and get a horoscope written
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Dev Patel was born into a Hindu family. I may not know what his religious views are, but he is a Hindu by birth.
According to Hinduism after a person dies his soul takes another birth. This belief is called Reincarnation (punarjanma).
they burn it
I don't know his DOB, but yes, he is a Hindu, a Punjabi Hindu from rajasthan born in Ajmer, Rajasthan.
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They get a bindi.
Buddhsim was founded by Siddhartha who was hindu by birth. He tried meditating after seeing a hindu Saint.
In Hinduism, birth ceremony is celebrated on 21st day of the baby.
It is believed that soul takes another form (body) and is born again. His Karma determines his next birth.
The same thing that happens if you aren't Christian or Jewish or Hindu or Buddist.
Reincarnation.