Peter was the leader, the pope.
Originally Peter was a Jew but became a Christian.
There is no patron saint of food.
He is a saint of every religion to some.
St. Sebastian is a Catholic Saint; therefore, he was Christian.
The pope became a Christian at the time of Saint Peter the first pope.
Peter was born Jewish, as were most (if not all) of Christ's immediate disciples. He was one of the founders of the Christian faith, but Christianity did not spit from judaism and become an organized religion in its own right until long after Peter's death. Peter would likely have considered himself to be a member of a Jewish sect based on the teachings of Jesus.
Saint Martin de Porres and Saint Martin of Tours were both Christian.
Saint Sophia is not a religion, but rather a saint in the Orthodox Christian tradition. She is venerated in both the Eastern Orthodox Church and the Roman Catholic Church as a martyr.
Yes, according to Christian tradition, Saint Peter's father was named John.
Saint Cecilia was a Christian. She is known as the patron saint of musicians and is celebrated in the Catholic Church.
Saint Peter, in addition to being the Pope (the earthly leader of the entire Church), was the bishop (the senior pastor) of the Christian Church in Rome.
There is no specific saint known for waiting at the door of heaven. In Christian tradition, Saint Peter is often depicted as the gatekeeper of heaven, with the keys to the kingdom.