Explaining The Immaculate Conception's Role

In the book of Genesis, God tells us that he would send the woman to bear a son, the Savior. Mary of Nazareth bore a son, named Jesus, the Savior. In the book of Revelations, a woman bears a male heir and the dragon tries to devour the baby boy, who is caught up to heaven. He (the dragon) tries to pursue the woman (as a serpeant spewing water to drown her), but he fails, so he goes off to make war against her offspring, those who kept God's commandments and bear witness to Christ.