Ok fire, I will address your questions. It probably wont be as direct as you expected but these things are interrelated.
I will begin with the existence of anything. I will speak on the issue of the existence of the universe but in order to do that I will go back to the beginning point, the singularity. Now I believe that both Einstein and Hawking stated that it would be pointless to think of what preceded the singularity. This is something that I feel is accurate but only if one is an unobjective atheist. You are not going to going to get proof that random chance created the universe, I can assure you of that. I am not an atheist however, so I will delve into the issue. The premise is that from nothingness, came something, without cause and by random chance. A singularity that was infinitely dense and infinitesimal volume. Without cause (obviously this would violate the law of cause and effect) but the entire the singularity violates all known laws of nature. This requires one to believe that something began to exist, existed outside space time, without cause yet with a definite effect. From there, without cause again but and again with effect, it expands etc. Something violating the laws of nature like that in truth is a supernatural concept. How about the existence of the laws of nature? Laws indicate boundries. Somehow these boundries came into existence without cause by random chance. Why would something that violates the laws of nature suddenly create laws, not a few laws but many that govern the universe, that created order for our universe. Not only order on a big scale but order on smaller scales aswell. The suggestion is that random chance not only did that but now creates boundries for order instead of chaos. Nothing about this concept sounds random at all. One can also not suggest that those laws already existed through eternity (a weird concept in itself) because the singularity violates those laws. It existed when and where those laws were not.
So then we get to life from non life, spontaneous generation if you will. The suggestion once again is that random chance created not only the complexities of life (why?) but life itself from non life. Why would anything ever even arise from non life without cause by random chance? So again we arrive at a premise that random chance is some ultimate creator. Random chance is not some ultimate creator though, I can assure you of that. Random chance (unaided by any outside force) will not even create something as incredibly simple as a car and yet the suggestion is that it created something as complex as DNA? As complex as even a single celled organism?
On the notion of random chance creating things. Now if life were the result of random chance, it would have no purpose. Which would also mean that a human is no more important than an animal, which is no more important than a banana which is no more important than a rock. The existence of these things according to atheism has no purporse. One could reasonably even suggest that based on those beliefs that anything that was created with a purpose is actually more important. So an eraser or a pencil ( anything that was created with purpose) is more important than life which is the purposeless the result of random chance. Now it is extremely doubtful that anybody would truly believe those things but even if they did, it goes deeper than that.
When a single celled bacteria dies I assume that an atheist wouldnt care (as they shouldnt) or a spider dying what have you but what about when their dog dies/their pet, an animal period or even a human? With atheistic beliefs, all that was lost was something that was without purpose, there is nothing to care about. If somebody cries because of a death, feels distraught or what have you, there actions are in direct conflict with this.
Now lets move on to the whole moral issue. Now lets pretend for five seconds that macro evolution does exist. The proposed theory is simlpicitiy + random genetic mutations + natural selection begets complexicity. The theory of evolution in a nut shell. Now, animals have no observable moral code, they simply act instinctivily. The fact that animals exist like that can be construed as making sense according to the atheistic belief (this of course is termporarily suspending all the other stuff I have brought up so far) However unlike those animals, humans demonstrate a moral code. If humans are merely evolved animals as atheists believe, why do we have a moral code? Human moral code is no illusion yet it defies atheistic explanation. Not even random chance could possibly explain that one but that is no surprise because it cant explain a lot of things. If there were no creator who is divine (good and goodness) and life were indeed purposeless, then there is no moral good nor bad. No moral law as all of it be completely subjective though it shouldn’t even exist in truth. The question then becomes, how come humans operate contradictory to that? Additionally, natural law dictates survival of the fittest is not simply acceptable but necessary for the continuation of the species. So not only is murder no longer objectively wrong but it is factually good. It would simply be getting rid of the weak. Genocide would not only be perfectly acceptable (overpopulation, getting rid of the weak, only the strongest survive) but it would be factually good.
Now as we know, humans contradict that stuff every day (this is inclusive atheists). If any person were to really adhere to those beliefs, they would be the first. Atheism is not as simple as not believing in God, there are a lot of things that go along with it.
I can assure you that there is evidence for a creator and far more than one thing either. We have the intellect to comprehend these issues because we aren’t mere animals. We exist not because random chance dicated it but because something created it. The laws of nature exist because they were enacted, there is no reason for them to exist otherwise. An incredible being incomprehensible intelligence created life, not random chance which cant even create a car unaided.
There is also the subject of the supernatural period but I didn’t want to get into all that at present time.
The alien issue you mentioned is an interesting one. I have recently been doing some research on that very subjective. I am remain objective to the idea and undecided on the issue.