[Mark17]

Whatever happened/appeared at Fatima is a false prophet.

Do you suppose the one who claimed to be the angel Moroni, who allegedly appeared to Joe Smith, was actually Satan?

[ealgeone]

It would seem to be in line with what are known of his capabilities....so yes.

Hence the need to square every prophet away with the Word as John tells us to.

Beloved, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world.(1 John 4:1 NASB)

And what do we test them by per John?

By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is from God; 3and every spirit that does not confess Jesus is not from God; this is the spirit of the antichrist, of which you have heard that it is coming, and now it is already in the world.(1 John 4:2-3 NASB)