The events may have really happened, but that does NOT mean they were from God.
Satan is the prince of the power of the air and has the power to do lying wonders and signs.
You are correct in acknowledging that Satan is the great deceiver. Many visions and miracles are recorded in the Scriptures. After the Resurrection, Christ appeared to "Peter and then to the Twelve" (I Cor. 15, 5). Paul spoke of "visions and revelations" from the Lord (II Cor. 12, 1-6), and the deacon Stephen saw the heavens open and Christ at the right hand of God the Father (Acts 7, 55-56).
Throughout Christian history, there has been the grateful reception of miracles and apparitions when they occur, together with the acknowledgment that such phenomena are not a substitute for faith in God. As such, the Catholic Church, over the centuries, has used strict criteria for determining the validity of an apparition.
What criteria have you applied in determining that the Fatima apparition is not from God?