It doesn't make sense. There are too many mathematical inconsistencies alone just within the first book of the Bible. But Lucifer is on the boards. He pokes at people and they get cranky if you call him on it. But I don't think end of days as foretold by Revelations is a party? But there are uninvited guest.
The exorcism is in Latin. People get possessed and they use bodies to hurt others but the body is just a shell. The exorcism will banish them back to Hell.
Hi. No. Not a shapeshifter. Just me. Whoever she is. They tried to take it away but she still exists.