Virgin birth of Jesus
The Gospels of Matthew and Luke say that Mary was a virgin and that Jesus was created by the Holy Spirit.  These Gospels started the belief that Jesus' creation was a miracle.  This belief, which is now common in Christianity, says that Jesus had no natural father; no sexual intercourse and no male seed was involved in creating him. The Gospel of Matthew also says that the virgin birth of Jesus fulfills a prophecy from the Book of Isaiah.