If you believe in good, in angels, you must also think that there is evil and therefore demons. Personally I am an atheist. But I have read several books on the subject, mostly by famous exorcists and the most famous in my country. The stories are incredible. Honestly as an atheist I tell you that yes, I think they can exist, because mental pathologies are excluded before practicing an exorcism. It can only be practiced after careful psychiatric and medical examinations. Maybe
