Aliens might have been considered to be gods but that does not explain all the mysteries of the universe and all the things that have happened throughout our history. There has been a lot of alien interactions that were attributed to gods but there have been many more unexplained things that were not related to aliens.
Where did aliens come from initially? I don't mean what planet or solar system but how did they come to exist? The bigger question is "did life in the universe arise from matter or from a spiritual non-physical element" and this leads to the other big question, "is there nothing after our physical deaths or do we continue to exist after physical death" and yet another big question "is there a God"?
After reading hundreds of books and a life of experiences and contemplation, I think there is no doubt that the universe is not only full of alien physical life forms but there are many spiritual life forms as well. The spiritual world is where all physical matter comes from. This means humankind and aliens. It is not logical that such a fascinating and complex universe full of life could possibly be an accident. With all of our scientific knowledge to date, we know enough to know that there are many, many aspects of the universe and life that we cannot explain.
So I would say that the universe is not simply physical matter, and life did not just appear from matter alone, but a spiritual element of the universe is responsible for life. As far as life after physical death, there is a ton of evidence to say that yes life does continue after death.
This issue is similar to the issue about the existence of aliens. Many people are reluctant to think there is really life after death because they don't think there is proof of it. But actually there is more proof of life after death than about anything else.
There are thousands of books and writings about people throughout history who have had spiritual experiences, who have seen ghosts or spiritual beings, who had had mystical experiences, who had had out-of-body travels, and who have had communication with the spirit world. If the spiritual world did not exist, science would easily show that there was no evidence. But science and real-world experiences continue to give us overwhelming evidence.
Personally, I have seen a spirit and I have had two out-of-body experiences in which my spirit left my physical body and I looked down upon myself. I have no doubt that when this physical body dies, our spiritual body or consciousness continues to exist.
Another set of evidence for life existing after death is reincarnation. This is another phenomenon that is supported by thousands of writing and millions of people who have had experiences and memories of past lives. You can read dozens of books or view videos that describe accounts of evidence for reincarnation so I will not repeat all of this information here. Some of the most interesting accounts of reincarnation are from writings by the psychic, Edgar Cayce.
In Edgar Cayce's book, "The Story of Jesus," he described some of his own past lives in the continents of Lemuria and Atlantis. He also talked about the many past lives of Jesus and how Jesus was also on these two ancient continents in past lives. Cayce said that Jesus had many lives on Earth beginning as Adam, Moses, Abraham, and others until Jesus he became fully enlightened. He then was born as Jesus to fulfill the purpose of bringing the Way to God through love. Jesus said that we should do as he did and we could be god as he became god. I think that too many people misinterpreted Jesus'message.
Jesus wanted us to live in his example of being a kind and loving person and with unconditional love, and then we could become enlightened as well. And we could be god, like him. We don't need to believe Jesus is the Way. We need to be like Jesus. We need to be the Way. What would Jesus do? That's what we should do to find the Way.
There have been several enlightened beings throughout history and they all have provided very similar messages and several religions have been created around these enlightened people and their teachings.
Christians want to convince us that Jesus is the One and only God, while Muslims want us to believe their version of Mohammad. But Mohammad was supposed to be a prophet in support of the lineage of Jesus. Jews believe in basically the same thing with their lineage going through the same leaders. Buddhist think that we should listen to Buddha. Buddhists believe in a path of enlightenment requiring suffering to learn compassion and understanding. Hindus believe there are many spiritual leaders or gods throughout history and we can learn from each of them.
If one or more of these enlightened people of our past are God or prophet, it does not matter. We do not need to argue about who is specifically right? We are all one. We don't need to argue about God. Every time we argue for our side, we separate ourselves from others. If you think the path to Heaven requires complete acceptance to one religion, then you put yourself superior to others and separate from them.
So, the question, does God exist can be answered as yes, but who and/or what is God? What can we believe about God if there are so many different religions, all claiming to know who God is but none of them agree.