(http://www.romancatholicism.org/mary/theotokos.html) By doing this she became the mother of all men, for as mother of the Head of the Mystical Body of the Church, she became the Mother of the Church.
Catholic Mariology (theology of Mary) has been a source of many debates over many hundreds of years. Mary has been written about in the scriptures, liturgy, prayers, and songs. She has been in the writings of saints, theologians, and in the teachings of many popes and councils. Mary holds a secure place in the Catholic Church. She is the Mother of Jesus, and the greatest of all saints. Mary gives hope and faith to the people of the earth. She is full of love for the people of earth. Mary conceived the Son of God through Immaculate Conception. She remained a virgin throughout her life. At the end of her life she was assumed body and soul into heaven. Mary's divine motherhood, which is clearly revealed in the Scriptures, is the ultimate basis for believing in both her Immaculate Conception and her assumption. The universal belief of the Catholic Church has been that because she is the Mother of God, Christ already shares with her, his body and soul. Christ ascended, through his own power as Son of God, into glory; Mary was assumed by the power of Christ her Son into glory. "Her assumption is an anticipation of the general resurrection, when we will be raised from the dead. As our Blessed Lady is now, so we will be."(McManus, 1999) .
There are four Marian doctorines: Immaculate Conception, Virginal Conception, Mother of God, and her Assumption into heaven. In 1476 the Immaculate Conception was made a feast day by Pope Sixtus IV, and in 1846, the United States bishops, at the sixth provincial Council of Baltimore, proclaimed Mary the patroness of this country. In 1854 Pius IX, after consulting with the bishops of the world, issued Ineffabilis Deus. This declared that the Immaculate Conception was a doctrine revealed by God.