Believing from the womb through the tomb

Do we actually believe in a God who can create a baby in a virgin's womb, or who can, three days after a man has died, raise him from the tomb? Do we believe in a God of miracles, who can make things happen which cannot be scientifically explained? Is it necessary to believe that Jesus was born of a virgin in order to be saved or to be a real Christian? Is it necessary to believe that Jesus…