Yes, some of these things do exist. Since I do not know how or why they exist, my explanation would simply be "I don't know." It is a much more honest answer than "If X happens it must be (god, jesus, satan, ghosts, spirits, aliens, etc.)." If you don't know, you simply accept the fact that you don't know. If you want to know, then you need to study and research to find out BEFORE reaching a conclusion that you know what it is. And once you do reach a conclusion, you should be able to support it with some kind of reasonable evidence.