Changing the subject from spiritualism to demonic possession. Nice try Gomer.
They have rituals because they don't know the authority of the Lord. If you can't do what you've set out to do, you might as well make it look good. I know the authority of the Lord and I have it working in my life. Waving crosses, lighting candles and burning incense doesn't bother the Devil. Nor do pious Latin incantations - witches and satanists do the same things to draw demons, not to get rid of them. But even they are forced to recognize the authority of a Jesus in a Christian with faith in the Lord who knows the scripture and functions in obedience to God.
Jesus works through the obedient because they are dependable and understand the consequences to the souls of others. He does not work through those who merely put on a good show. And deliverance is not a pretty thing nor a safe thing - if you don't know what you're doing and have no authority, you can be very badly hurt, or killed. Ya'll just have no concept of the consequences of what you do and believe - none.