Why we believe in god(s) Agree/Disagree with arguments presented

Human invent Gods for a simple, fundamental reason and it has to do with the very cycle of life. The fact that we die is often too complex and painful to handle, the idea that someday our most treasured memories, our greatest ideas and most beloved feelings will vanish along with the dust of our bodies, causes people to believe in something greater because they are not able, or don't want to accept reality as it is. Now, I will start of by enunciating two simple reasons that justify my atheism, it's worth noting that I will be defending the idea that the monotheistic deity of Islam and Christianity isn't real: 1) The main reason why I don't believe in the God described in the Bible and the Quran is because it is a purely subjective cultural invention that depends on sociological changes throughout history. Why didn't early hominids speak of an all-mighty creator? If the Christian and Islamic God was real, what was the all-mighty craftsman of the Universe, doing during the thousands of years in which mankind worshipped others Gods such as Zeus, Odin and Ra? If the monotheistic God were real, then his theological characteristics (the trinity, his unlimited power, the fact that he is eternal, his commandments and general philosophy) would be independent of culture and society, of conquest and historical dynamics (by which I mean the way in which cultural identity is wiped out through conquest) meaning that no matter what group of humans you were dealing with, be it Sumerians or Macedonians, despite their linguistic and political differences, they would each "discover" the nature of this one God independently of imperialism. Since this is not the case, it means that the believe in a particular deity depends on what empire conquered what nation at a particular time in history. For example, had Hannibal successfully defeated the Roman empire, his religion would have been forcefully spread in the new conquered territory and its ancient believes would have been forgotten. This is exactly what happened when the Spanish conquistadors wiped out the religious, linguistic and cultura, identity of American natives, replacing their very own language and religion through fear and genocide. To sum-up this particular argument against the existence of God as viewed by Islam and Christianity, says that God can't be real because his existence is not discovered nor found in nature, it's not an objective thing that groups of humans can have access to independently, but rather it is a made up concept, imposed by invasions and conquests. If early Homo Sapiens had drawn something that represented the holy spirit on cave walls, if Greek poets had spoken about the garden of Eden independently from the Jews, if the Egyptians had thought of a being similar to Allah before the Muslims, then it would mean that God is indeed an objective concept and therefore a real one but this has never been the case. We have on one side, certain similarities between religions specially in polytheistic ones for example, in Greek mythology the God Zeus is very similar to Odin and Ra, the idea of immortal warriors like Siegfried and Achilles, means that cultures have based on one another's myths to construct their own spirituality (one example of this is the myth of Deucalion the son of Prometheus who is told by his father to build an ark since Zeus had sent a deluge to wipe out humanity is virtually identical to the story of Noah) but on the other side of the spectrum, we find that ultimately, each religion and mythology offer a whole branch of explanations for the same thing: reality. If reality is one and objective, how can there be multiple interpretations of the same thing? General relativity is general relativity if you are in Greece or in Egypt, a circumference has a radius here and in Mars. This is basic quality of truth: that it is universal and objective and God certainly has none of that. 2) The second reason why I don't believe in God is a simple one really. If God was real, and if indeed he was the creator of the Universe then he would have to know the language of reality and that is, the handful of physical laws from gravity to electromagnetism which govern everything from the motion of atoms to the luminosity of galaxies. If indeed he existed, and if he indeed inspired people to write down his account of creation, then you would expect Genesis to contain a description of the Big bang, sure the names of forces and constellations and magnitudes can vary but the math stays the same, the key concept of inflation is unchangeable, you can call it magical growth but the logical relationships of quantity and geometry that back up this idea together with the cosmological evidence that is abundant in the wombs of space, make it a fact. Since genesis ignores the Big bang, galaxy growth, the age of the solar system and most important of all...EVOLUTION! you are left with two possible explanations: Either God doesn't know the science that went into the making of the Universe in which case he didn't create reality or (and this is the most likely one) he doesn't even exist in the first place. A being cannot be ignorant of atoms and plasma, of black holes and electromagnetism if he created this Universe and the way in which Genesis is written is fantastic for literature, but for science it's simply nonsense.