Christianity is a religion that believes in one God. God created the world and everything that is in it. People who are Christians believe that God sent his son, Jesus, to earth to save the world from sin. They also believe that after Jesus died and rose from the dead, he sent the Holy Spirit to guide them and help them do good things. Christians follow Jesus’ teachings, which tell them to be kind to each other and love one another. They also go to church to pray and worship God.