Juan Diego said that the young girl looked as if she was of Aztec descent. Mary was Jewish, from the line of David.
• Many accounts claim that the girl said, “I am the ever-virgin Mary, Mother of the true God.” Catholics believe Mary to have an exalted place in heaven, with the most direct access to Jesus and God the Father. They also believe Mary was a perpetual virgin. Such a concept is nowhere taught in Scripture. Also, the Bible never calls Mary the “mother of God.”
• The young girl that Diego saw asked for a shrine to be built in her honor. The biblical Mary would never ask for anything to be done in her honor. Rather, she would instruct people to honor and worship God (see Luke 1:46).
• In some accounts of the story, the lady says she would answer prayer. This is also unbiblical. God alone answers prayer.
Did something supernatural occur on Tepeyac Hill and witnessed by Juan Diego? Yes, probably. Did Mary actually appear to him? No. Was the message from God? Based on its disagreements with the Word of God, no.
Read more: http://www.gotquestions.org/Lady-of-Guadalupe.html#ixzz3dLFRW8e8
But the children and residents of Fatima had a good UFO sighting.