Mary is indeed the Mother of God.
Even before Christ was born, she was honored by heaven when the Archangel Gabriel appeared and said to her: "Hail, thou that art highly favored, the Lord is with thee: blessed art thou among women (Luke 1:2.
Scripture further proclaims of her that "henceforth all generations shall call me blessed" (Luke 1:4, because from her womb came forth God in the flesh. This means that all who believe in Christ and in the Bible must give special honor and veneration to the one that is "blessed among women."