The opposite of the above is as follow: The Bible is clear that demons are always external to the believer and never internal. Satan and demons can tempt a Christian but not in anyway indwell them since their bodies are the very temple of the Holy Spirit. As well there is not one word in the Bible that encourages a believer to have any kind of exorcism gentle or rough. Jesus did not perform exorcisms in any form but simply spoke a word to dispel demons. Sin is to be taken seriously and dealt with by confession to God but never mistaken for a demon. Sanctification is a life long struggle but God gives grace. The only way to thoroughly clean up schmutz is to clean it up with large applications of the Word of God. Do your own research, get the above studies, and compare all of it to your Bible and what it teaches. Then help someone extract themselves from false teaching and clean up the spiritual schmutz.