I do not know if this man is innocent or sarcastic in his response, but he continues to drive the point home. Here is the religious leadership of Israel and they have no idea from where this man comes, but He has a power to heal that can only come from God. The healed man has no questions because he was blind and now he sees. This healing came clearly from Jesus. Today many churches have leaders who refuse to see or acknowledge Jesus and His Word. They are doing what is right in their own eyes and seek to have power in this world. They are no different from the leaders we see here.
Consider: 2 Timothy 3:3-4