Do you have to believe in Jesus to exercise authority in His name?

As believers in Jesus we inherit the power to rebuke Satan.  However there are many out there who seem to think that they can enjoy the benefits and power of believing in Jesus without actually believing in Jesus.  Let's see what Scripture has to say about that.

Acts 19:11-16(NKJV)

Now God worked unusual miracles by the hands of Paul, 

so that even handkerchiefs or aprons were brought from his body to the sick, and the diseases left them and the evil spirits went out of them. 

Then some of the itinerant Jewish exorcists took it upon themselves to call the name of the Lord Jesus over those who had evil spirits, saying, “We exorcise you by the Jesus whom Paul preaches.” 

Also there were seven sons of Sceva, a Jewish chief priest, who did so.

And the evil spirit answered and said, “Jesus I know, and Paul I know; but who are you?”

Then the man in whom the evil spirit was leaped on them, overpowered them, and prevailed against them, so that they fled out of that house naked and wounded. 

Any questions?  :)