The religion that includes the practice of godparents is Christianity.
It depends on the religion in question, but in Catholicism the godparents are the witnesses to baptism and you can't retrospectively change who witnessed something.
I don't think there are any hard and fast rules, but probably not. Although godparents are often thought of as purely symbolic, some believe that the godparents agree to help bring you up in the faith in which you were baptised.
They practice Islam religion.
The First Amendment of the United States Constitution allows people to practice their own religion. It includes the Free Exercise Clause, which protects the right to freely practice one's religion without government interference.
The religion that does not practice circumcision is Jainism.
I don't think he had godparents.
You need godparents because if your parents die and you have nobody to look after you then your godparents can look after you.
Customarily it would be the godparents responsibility to provide the candle. However, in practice, the Church provides the candles.
They practice Roman Catholic religion
Buddhism is the religion. Buddhist practice Buddhism.
You can only have Catholic godparents or Orthodox godparents. No protestants can be godparents in the Catholic Church.
It is entirely up to you, how seriously you wish to practice your religion.