I think that the idea of these "aliens or UFOS" being spiritualistic carries a more logical premise than life on other planets and here is why I think that.....
IF there were life on other planets that would be known to contact this planet (earth), I would think that would be something worth mentioning. To say that God didnt think that was important...not sure. I won't speak on behalf of Him as I am far from worthy!
Remember, God sent His ONLY Son to be born in our likeness to die for our sins. Jesus is said to have only died once. With this being the case, that would say that either these other life forms were perfect and did not need a redeemer, or these life forms (as we are comparing them to humans) did not exist.
IF they do not need a redeemer, than that would say 2 things also.
1. They choose not to sin but are able (like angels say)
2. They are incapable of sin (like God).
I think that its easy to scratch #2 off the list right away as there are none like God.
Lets play on the first and explore that they are angelic beings.
Since angels can be both working for God and for satan, then that means 2 types.
If they are Holy angels, then why and what are they doing here?
Although I would like to think that there are better ways to appear to man than hovering over Roswell, I guess it could be a possiblity.
If they work for satan, then why and what are they doing here?
So far the only things to come of UFOs are confusion of the people and the questioning of the existance of God. To me, this seems more of a likely scenario.