Virgin Mary -- the original Goddess. Early church leaders (Patriarchy if ever there was one) needed to incorporate a Goddess/female to appeal to the Pagans they were trying to convert. so voila! a virgin mother.
7 Great Blessings of the Rosary (St. Louis de Montfort): Gradualy gives us a perfect knowledge of Jesus Christ Purifies our souls,washing away sin Gives us victory over all our enemies Makes it easy for us to practice virtue Sets us on fire