Because I am challenging your false doctrine?
Be at ease, I'm not offended ... I have been relegated to the "merely religious" many time by those in your creed.
If nothing else, this scariest verse in the Bible should give you pause ... and force you to seriously consider repenting from false doctrine. You have gone way beyond the text in your imagination.
Matt. 7:22-23
22 Many will say to Me on that day, 'Lord, Lord, did we not prophecy in Your name, and in Your name cast out demons, and in Your name perform many miracles?"
23 And then I will declare to them, 'I never knew you; depart from me, you who practice lawlessness.'
Father Gabriel Amortth and Fatherr Chad Ripperger are good resources for what should and should not be done by lay people with regard to the casting out of demons. For the laity, prayers of deliverance can be very effective, but care has to be taken that those doing the praying have some form of natural authority over the one in distress. So a father can pray very effectively for his spouse or children or parents or grandparents, but he should not attempt the same for a friend or aquaintance.
It is the Blood of Christ that we invoke to cover us and free us from demonic connections and acitivity. Our power comes not from ourselves but from being part of His Mystical Body, for it is His Blood, His Name, and His sacrifice on Calvary that has redeemed and saved us from sin and eternal death.