Firstly, this a scientific question, not an atheistic question. But, to answer: The origins of life have been lost forever. Fossil evidence, though sketchy that far back, has shown that life started on two, possibly even 3 occasions. There is in the strata used to date fossil finds evidence of three types of microscopic organisms, followed by evidence of an extinction event (massive rapid climate change), several million years of nothing, then fossil evidence of two [b]completely different[/b] types of microscopic organisms. There are many theories behind the origins of life. The two most popular at the moment are panspermia and autogenesis. Panspermia revolves around evidence of microscopic organisms in meteorites, chunks of rock that have fallen to earth. The theory goes that life evolved somewhere other than earth. Some theories say on a planet around another star billions of years ago, some say the asteroid belt may once have been a planet and its destruction showered the young earth with meteors, others believe that these organic compounds where formed in the explosion which created the nebula which created our solar system. Either way, the pre formed organics where cryofrozen by the vacuum of space, resurrected after impact and began to propagate. Regardless of whether or not panspermia was involved, autogenesis more than likely occurred at some point. Autogenesis essentially means it just happened. I'll explain the evidence for it as best I can. We know that on the young earth there was a lot of water, carbon, oxygen and nitrogen, with a very high percentage of carbon dioxide. All of these gasses would have been dissolved in the water (not all gas on earth, but some of all gases listed above). We can also be pretty sure there would have been various minerals dissolved in the water from the erosion of rock. We also know the young earth would have been very hot, because of the carbon dioxide, and ravaged by massive storms. Well, if you get a water sample with the various dissolved gasses and minerals in it and heat it up then organic compounds start to form naturally. By organic compounds I mean fats, sugars, proteins etc. in the end they're basically all just different chains of hydrogen, oxygen and nitrogen. But that alone isn't enough to create life. However if you then simulate lightning strikes on this heated water, more complex organic structures. Lipids (fat molecules) will form double concentric spheres (a precursor to the cell wall, still found in micro organisms today) for example. Or short strings of RNA. You have to bear in mind that these experiments have all been short lived and only taken place over the last 50 years or so. Over the next several million years, it is believed, all these organic components started to team up, so to speak. Some RNA gets stuck inside a lipid. A DNA string attaches to another. Eventually you end up with with several (probably millions) of different single celled organisms effectively living [i]off of[/i] one another. One organism can create energy by turning carbon dioxide into oxygen (that's right, oxygen breathing came much later), another organism can replicate RNA. The different products would have been passed out of the organism and absorbed by one who needed it. We have some fossil evidence of this step, but like I said before, it's sketchy. It's believed that this muddle of prelife was one huge collective. Not consciously, just that they existed in one place, possibly in a mat or film that covered all the worlds oceans. This collective is known as the Last Universal Common Ancestor (LUCA) because over the next few million years the various different organisms assimilated each other, becoming a single species, still single celled but capable of performing all tasks required to maintain life by itself. This single species is the ancestor of every type of life except viruses and archaea. The fossil evidence starts getting stronger and stronger here. Life diversified and became more abundant, many types of organism (still single celled or simple multicellular collectives, not even multicellular organisms really) evolved to feed off rock, increasing erosion and there for the creation of sedimentary rock, which is much better for creating fossils. With all these organisms breathing CO2 and turning it into oxygen, eventually oxygen breathers evolved. This was bad news for the CO2 breathers because oxygen is as poisonous to them as CO2 is to us (there are still CO2 breathing bacteria nowadays). Shortly after the first oxygen breathers appear in the fossil record, all the CO2 breathers disappear. The split between plants and animals happens around here. Both diversified and started evolving into the first multicellular organisms. Plants spread to the land (probably in thin sheets similar to slime moulds) and diversified even more. The basic model of evolution takes over here with the evolution of insects, jawless fish and the genus that contains jellyfish first. Arachnids evolve from insects. Jawed fish from jawless fish. (Remember the original group continues and diversifies) The jawed fish then evolved into part fish part amphibians and took to the land. They then evolved into amphibians, then reptiles. Reptiles split 4 ways, one line continued as reptiles, one became archosaurs (the most famous look like stocky lizards with massive fins on their backs, went extinct just before the dinosaurs became dominant), the third line became the dinosaurs and the fourth became mammals. That covers everything except birds. Dinosaurs diversified into a dozen or so different groups. One of these eventually became birds. A brief summery of the atheist creation story. Lol.

It is known the simple chemicals in the right atmospheric conditions (warmth, oxygen, water, light, salts) created aneaba (cant spell it but ya). These singled celled organisms, still existant today, slowly evovled to the creatures they are, gaining traits from enviromental and climatic conditions, and even thought patterns. The thought patterns also impact tatics when a variety of areas, such as hunting and mating, giving a sort of flare of creativity, between each animal.

Well no one actually knows the beginning of the beginning. Religious people assume God clapped his hands or something, but who created your God? Im not atheist...agnostic actually. I hope theres a God but optimism isnt my strong suit

Science. [spoiler]Just because a bunch of men came along and told every other established religion that at the time were hundreds or thousands of years old they were wrong and their Gods were false doesn't make your god real. They used fear, threats, torture and murder to convert people to their way of thinking.[/spoiler]

Why is it always focused at atheists? Agnostics are prone to believe the same stuff... Regardless, I believe the theory that proteins combining in the correct atmospheric conditions to form single celled organisms is the closest thing to it.

Due to the gas mixture in Old Earths Atmosphere, various elements and compounds combined by happenstance and those combinations eventually led to the first living organism to be created. As time progressed, such organisms became more and more complex. A whole shitload of years later and here we are.

Primordial ooze is one theory.

Maybe there wasn't a first, nor will there be a last, living cell/organism. The creation of our universe may have been the ending of another.

The big bang i guess.