It is funny. My 11 year old daughter has recently had a lot of questions and initiated some conversations on aliens. I am sure movies and what all are back of it.
We watched "Signs" not long ago. It disturbed her and we erred in watching it. The suspense and alien figures were a little more than she was prepared to see, and frankly it surprised me that she reacted so to it and more disappointed me that we did not appreciate the impact it might have on her. I thought it would be a useful discussion tool to see how fiction rubs up against faith, but what she got was alien dreams and a lost night of sleep.
So, aliens have been talked about in my home lately. When asked if I think other intelligent life is out there, I simply say there is no proof of it, that spaceships with alien critters from space did not enter our conscious thought processes until we started developing technologies that were on the threshhold of human flight. It is more likely that we invented aliens from space than God did. We have certainly fictionalized it more than there is any evidence of it.
Now, I know there are those who say UFOs have ancient portrayals and reports. I will not dispute that. But, the humanoid in a spacecraft is modern imagery. One early, respected UFOlogist, Jacque Vallee, who published the best early scientific defenses for the belief in ET spacecraft and aliens, later rejected it. He went on to connect religious experience with multidimensional visitations and to theorize that UFOs and humanoid aliens come from these realms. The ---- ahem ---- mainstream UFOlogy community skewered him for it and he labels himself a "heretic among heretics" . Vallee's surmises are more akin to the biblical phenomenon of epiphanies and appearances and supernatural events. All that to say this: if humanoid aliens in craft are visible to us, we have perhaps more reason to view them as from another realm (dimension) of the supernatural than from space, and to weigh the whole matter in cautious prayer to God that we not be soon taken by false reports of His appearing.
So, at my house, aliens are not spacemen. They are fictional, and maybe even fun in the right story. We are God's particular creation in His image and there is no reason to suspect or expect that science will discover anything in terms of extraterrestrial intelligent life.