Saint Mary, aka The Blessed Virgin Mary, is considered a saint because according to Christianity, she, as a virgin, was chosen by God to give birth to Jesus Christ, the Son of
… God through whose sacrifice humankind had been forgiven for their sins, and can now repent. She is a hugely important figure to all forms of Christianity, especially Catholicism, because she is the Mother of the Son of God, which might help to explain why she is considered a saint. Catholics believe Mary was conceived without Original Sin, immaculately conceived Jesus, and lived a chaste and sinless life with Joseph . She was assumed, body and soul into Heaven, and is Queen of Heaven and All Saints. (MORE) 
