God has at times through history spoken his word and words of prophecy as well as performed miracles through men of faith. Strangely, however, the Scriptures teach that there are and will be false prophets and miracle workers. Strange, because their faith and testimony is false, yet the prophecies and miracles are real!
Why would God delegate super natural power to the unbelieving? Perhaps to test the faith of the saints. Perhaps to further delude the unbelieving in their false assurance in order to bring greater judgment upon them.
Read Christ's warning for yourself,
21) Not everyone who says to me, 'Lord, Lord,' will enter into the Kingdom of Heaven; but he who does the will of my Father who is in heaven. 22) Many will tell me in that day, 'Lord, Lord, didn't we prophesy in your name, in your name cast out demons, and in your name do many mighty works?' 23) Then I will tell them, 'I never knew you. Depart from me, you who work iniquity.'Matthew 7:21-23 (WEB)And again,23) "Then if any man tells you, 'Behold, here is the Christ,' or, 'There,' don't believe it. 24) For there will arise false christs, and false prophets, and they will show great signs and wonders, so as to lead astray, if possible, even the chosen ones. 25) "Behold, I have told you beforehand.Matthew 24:23-25 (WEB)
Do not be impressed in the least with prophecies and miracles even in they are real, for the prophet or miracle worker may still be reprobate, have a false testimony, and be cast into Hades. Instead let us keep our eyes and hope trained on God's Word and the cross of Christ, the Son of God's willing sacrifice for all our sin.