[God is good]

You know, just because something is supernatural does not mean it's of God. Satan has many supernatural powers, in fact, he is the second most powerful being in the universe at this point. Jesus commanded Christians to test the spirits against scripture and to not be fooled by every whimsical supernatural act. All that one needs to know is that he needs to trust in Jesus Christ alone for eternal security.

[God is good]

And what is meant by test is that anyone (or anything) that says Jesus is the Christ, has come in the flesh, is the Son of God, and is the only way to salvation, is of God; otherwise it's of Satan.