Do buildings have builders? Do paintings have painters? Did someone build the computer you are using to type this question? Answer to all is yes, of course. Why? Because design only comes from a designer. So, look at the universe, trees, plants, animals, humans, stars, planets, oxygen, seasons, etc. all of the immense order and design of the universe that is infinitely more complex than anything any human designer has made or can make, and so there is a Creator/Designer/God thus. "For what can be known about God is seen in creation," Romans 1.
Aliens, it depends on how you define them. Are they mysterious space rider beings or demon spirits that are deceivers? Looking at the accounts of their events, the second is true that they are demonic deceivers. The documentary UFO's, space travelers or demonic deceivers by Liberty/New Liberty Videos is excellent. As far as the above picture, this is a picture of pretty obvious Egyptian origins, that when zoomed in on looks like aliens in modern American movies, is that concrete evidence? No not really. But accounts of the events are.