Power and Authority
The church has been given authority to rule over satan and all his demons. We do not have authority to control human wills. So many Christians are not aware of the power and authority that Jesus has given them, and allow the devil to get away with oppressing them and their families. Jesus spoke directly to His disciples and said this:
Behold, I give unto you power to tread on serpents and scorpions, and over all the power of the enemy: and nothing shall by any means hurt you. Luke 10:19(KJV)