It's not me

Paul and Barnabas are saying, "It isn't us. We're not the ones doing these miracles. God is doing them through us. We are not worthy of your worship. We are servants of the living God." That takes a lot of pressure off of us. But it's not a cop out. It's just a salutary acknowledgement that we are not in charge. We have only borrowed power. God gets the glory and praise. We get the privilege of serving him.