I suppose I have a different viewpoint, coming into this with a Christian bias. Most people think that aliens and UFOs are incompatible with Christianity. We have a false dichotomy of science vs. religion in Western society, and I don't accept that.
Science vs. Religion? Says who?

After all, the only difference between "hostile entity from another dimension" and "demon from the spirit world" is one of connotations. I don't see that they can't be the same thing. UFO sightings are usually tied in some way to the occult. That can't be a coincidence.