The supernatural is still possible in our day. There are signs that follow the gospel when it's preached but why many members of the church aren't effective is because of knowledge problem. The day you know, the devil has no hold of you.

Without faith, you can't appropriate everything you have received in Christ. The same faith it takes to be saved is the same faith it takes to walk in power. When one has the knowledge, one puts it to use with simple faith so one can be effective.