Language and us, the users of language, also do this with inanimate or abstract ideas. Aliens may not exist on Mars or in outer space but they exist here on earth. We created aliens. I can say the word aliens and a million images are conjurred up in my head. We even make movies about aliens, such as Men in Black, Space Invaders, etc No scientific proof has ever been discovered to prove that there are little green men running aronud other planets, but here on earth they are known to us because we can speak of them.
Aliens exist because they have become a word in our vocabulary.
Many other things are created through language. Religion s very existence hinges on the ability of being able to pass beliefs to future generations. We pass these beliefs on to other generations through language. God isn t anything that I can touch or feel, but he exists. We have on earth created a Messiah to fufill our spiritual needs.