People that argue against demonic possession being real, and it only being a medical condition of some sort, have never dealt with real demonic possession. Any medical condition is the FRUIT, not the ROOT of the problem, the root is spiritual.
And I am qualified to speak of this because I had terminal cancer which the Lord healed. I had no meds, nor treatment of any kind. And again, the root was spiritual, not physical. Deal with the root, and the fruit has to go.
Same principle shown when the Lord had them build the temple, and send for Egyptians and Chaldeans, who were previously banned from close association because of their pagan religions. But they were specialists at their part in the temple building and when it was done, they left and the priests cleansed the temple. The spiritual problem is there to do a job, and when it's job is done, it has to leave. ALL things work together for good to those that love the Lord, even if it appears to be a bad thing at the time.