Do Aliens Exist?

Do aliens exist?
We have many arguments about the existence of aliens for example; Scientifics have discovered water in other planets, so if They are probably life in other planets, forme if there is life on other planets with intelligence perhaps superior to ours or maybe with lower intelligence but that is not the issue, there may be life on other planets in othergalaxies like Andromeda, black eye etc.
Since they are far from our galaxy, the Milky Way, we do not see these planets not know whether there is life on those planets. Humans are not alonebecause it would be illogical for God to create a universe so big and other planets and has only one species of intelligent life, and if so would create more planets may have anotherpurpose as move when the earth is destroyed by the very humans?, but I doubt it. If we can go to other planets where on earth can no longer live but have to be other types of intelligent life onother planets. There is evidence of UFO's taken video but do not believe in such things as technology can recreate those things and can be modified video although many people believethat, there are researchers and can be convincing. There are things in this world that are inexplicable as the Nazca Lines are figures that travel thousands of miles in a sort of drawingsignificant. Which are unexplained by their large size. To see complete those lines has to do with a satellite as well as occupying google in google earth there can be investigated in greatdetail those lines.
The Egyptian pyramids are other inexplicable things because for their size and weight of the blocks with which they are constructed, those blocks in those days wereimpossible to lift as there was no technology or equipment to do so. Believe or not, we may think about many possibilities but according to the proofs we have I think they are still not enough.