Virgin birth » Christ not the son of joseph
Now the birth, of Jesus Christ, was, thus: His mother Mary having been betrothed to Joseph, - before they came together, she was found with child by the Holy Spirit.
Wherefore let My Lord Himself give you a sign, - Lo! a Virgin, being with child and giving birth to a son, thou wilt call his name Immanuel.
and knew her not, until she had brought forth a son, - and he called his name Jesus.
But Mary said unto the messenger - How, shall this thing be, seeing that, a man, I know not? And answering, the messenger said unto her - The Holy Spirit, shall come upon thee, and, the power of the Most High, shall overshadow thee; wherefore, even that which is to be born, Holy, shall be called, Son of God.