The prophecies state a pure young woman will give birth to God's son.
What did Isaiah prophecies about Jesus?
Isaiah 7:14: According to Isaiah, God's son will be born into a pure young woman. Matthew 1:18–23: The prophesy of Isaiah comes to pass. Isaiah 9:6: Isaiah foretells the birth of Jesus Christ, referring to him by a number of names. Micah 5:2—Micah foretells the birth of Jesus in Bethlehem. Christians refer to him as Christ because they think he is the Messiah, or Savior, foretold in the Old Testament of the Bible.
Christians believe that God provides people salvation and eternal life via the crucifixion and resurrection of Jesus, with Jesus's death atoning for all sin and restoring humanity's relationship with God.