yet religion can still say this is a case of possession. because religion is mostly based on faith, really all you have to do is say you believe in god, the devil and the bible, and that can be enough "proof"
if you cant say what specific mental disorder it is, you cant argue with religion, even if you could, a religious person could still say the disorder is caused by the devil possessing that persons body, because science still cant prove that its 100% untrue.
Im not religious, so i really dont know what im talking about, im just saying that when you try to disprove religion with science or the other way around it doesnt work, religion vs science fights will always be pointless. you might say that religion is ridiculous to say that some magical wizard in the sky created everything. and they think you are just as crazy saying that a tiny ball of mass that somehow came from nothing exploded and created the universe.