Again, someone may say that that was the disciples long ago. But, Mark 16:17 says, "And these signs shall follow them that believe; in My name shall they cast out devils; they shall speak with new tongues."
This is the Great Commission of our Lord. He commanded the people who were to come after Him [anybody who believed in Him] to take power over demon spirits and cast them out in His name.
In these last days, there will be multitudes of people needing to be set free. The church must set itself for the greatest battle in history against demon power.