The cross is the main symbol of Christianity.
About 2,000 years ago, Jesus was born in Bethlehem. Jesus was a Jew. In his early thirties, Jesus traveled from village to village, teaching in the synagogues and healing those who were suffering. Jesus created instability, something the Jewish religious authorities feared. Soon, a faithful group of men began to follow Jesus and call him their teacher. These men became his disciples. Jesus taught his disciples about the will of God and about the "new covenant" God will bring to humanity. Jesus helped them to see that mankind is bound to the pain of life as a result of sin. Due to sin, mankind lost its relationship with God.
The location of origin for Christianity was Jeruselum.
The fish symbol was first created to not let the Romans know what the Christians were referring to in different writings.
Some beliefs of Christians are Monotheism, the belief of only one God, that after someone dies, they go to Heaven or Hell, and that Jesus is the Messiah.