Extraterrestrials
I believe that extraterrestrial "aliens" exist. I believe they have visited us and that they have abducted members of our own species. I also believe that the government communicates with them secretly and regularly. I believe many UFO's have been seen and I believe that many people have obtained materials from such aircraft that have fallen into Earth and been rendered unusable. I believe the government is covering up our knowledge of such craft and of everything I stated above.
The thing I don't believe in surrounding this subject is the origin of aliens. So many people assume they came from other solar systems and galaxies. When people argue against other planets being survivable or being the birthplace of life, the believers tell them they can believe whatever they want.
Evolution is something I have taken a long time to think on before believing. I just recently gave up my faith in Christianity. No, don't worry, I won't become an atheist. I strongly believe in God, but I believe the Bible and all major, organized religions are false.
So now that I'm open to the theory of evolution, I can express the following idea.
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We humans have just gotten to the point of organized societies and large community efforts to better our living conditions. It's been about 10,000 years or less since the first groups of humans started acting this way. For about 2 million years, humans have been given the ability to control their environment with very large cranial capacity. About 4 million years ago, we diverged from the other Great Apes in terms of behavior and mental capacity. Before this, apes all acted similarly and monkeys as well. In the history of evolution, oftentimes species are left intact as small populations move on and evolve. It is as though God saw something good about them and sought to keep them around for a while.
What I think happened a few million years ago is that a Great Ape stemmed off of the evolutionary tree of the primates and went on an evolutionary rampage, plowing through to a brighter future in record time. This ape stood upright and lost its hair as the jungles gave way to grasslands and the hiding place of choice changed from trees to water. The development at each stage slowed as other populations continued to evolve. The most evolved population continued to advance as the other populations stagnated and went on with their primitive lives. Soon, the most advanced lifeforms on the planet were similar to us modern humans in terms of mental capacity and cultural advancement. The thing about them was their oneness with nature. They were similar to Native Americans in their knowledge of the Earth as a system that should be revered, not commanded. They had the knowledge to build technologies as advanced or moreso than we had in the Industrial Age, but they chose not to. They built structures and used the land, of course, but they did not abuse it or damage it with wasteful technologies.
Somewhere along the line, they needed to get off of the planet. Whether they saw an upcoming apocalypse or a just had the desire to leave, they used their brains to build ways of entering space. Of course, many of them stayed, but plenty left to visit other objects in space, such as the Moon, Mars, satellites of the gas giants and even other solar systems. Their technology continued to grow with their brains and they adapted to their material lifestyle. They grew weaker, yet more sensitive to their senses and were better able to use their ever advancing equipment.
The remaining portion who stayed on Earth died out due to disease, the rise of violence, or any other theory you can think up on your own. The last refuge of the species was Atlantis, which was dismantled upon the discovery of the emergence of society in humans, another species of intelligent ape. They continued to visit our ancestors, though, since we are, in fact, related evolutionarily. For the past million years, our more intelligent cousins have witnessed the emergence of a rival. We are more violent and apt to make irrational decisions than they were at the same phase, though. They also evolved more quickly due to a desire for intelligence, whereas humans have been content with stupidity for far too long. They have communicated with us indirectly and tried to steer us in the right direction, but we are too ignorant and stubborn in our ways. We, even now, do not believe in their existence, being too arrogant to see that there may be things better than us out there; beings with more intelligence and virtue than any human could possibly have.
To be honest, the aliens must be a group of deities to put up with the shit we deal them with such patience and understanding. I think that, if anything, is what has stopped us from believing in them. They don't think the way we do.