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I kind of have a theory on how darkness ties into everything. Basically, this is how I think creation happened in Supernatural. It is pretty long, so don't feel obligated to read all of it. Here goes-

In the beginning, all there was, was The Darkness. This force is also known as Chaos, and Void, in different religions. The Darkness has existed forever, created by no one, and answering to nothing. Out of the Darkness was produced other entities. These beings were known as the gods. A few examples of these gods were Yahweh, Kali, Zeus, Mercury, Balder, Death, War, Pestilence, and Famine. The gods lived within the Void of Darkness that created them. They began to make their own creations, following the actions of their maker. Yahweh, one of the highest-tier of Gods, created beasts called the Leviathan, which resembled the same darkness and evil as The Darkness. The Darkness didn't want the gods to have their own creations, so they forbade them from making more children, and hid away the ones they had created. Yahweh wanted to be a creator, however, not just a slave, so he rose up and started a war against The Darkness. He created four celestial beings of light known as Michael, Lucifer, Raphael, and Gabriel, to help him fight against The Darkness. A lot of the gods joined Yahweh, such as Death, Famine, War, Pestilence, and Fate, while the other gods sided with the darkness. Eventually, Yahweh and his army together managed to enclose the Darkness in a pocket dimension. The Darkness would have been able to escape the link had been left open, so God took the link between worlds, and sealed it with a mark. He placed the mark upon Lucifer to guard, as he was his must trusted lieutenant. Yahweh then saw that the beats he created long ago (the leviathans), were alike the Darkness, and so they were dangerous. Like the Darkness, he locked them away in a separate reality known as Purgatory. He created a realm called Heaven, where he resided with his Arch Angels and allied gods. The gods that sided with the darkness were cast or of Heaven, into the realm that would later become Earth. The gods that sided with God were given special jobs and tasks to carry out. For instance, Fate was given the task to make sure things play out as they should. Death, Pestilence, Famine, and War were given places in his apocalyptic plan. He gave them each rings that would allow them to channel there powers. He created other Angels that were much like the archangels, yet not as high up, called Seraphim, Grigori, Rit Zien, Reapers, and Cherubim. Then he made the earth, and started evolution, which would eventually produce the humans. With the Mark on his arm, Lucifer was slowly being corrupted. The Darkness was not able to escape it's imprisonment, but was able to influence the host that bore the Mark, which linked the Darkness to this world. When humans finally arose, and God places them in a perfect garden, the Mark had twisted Lucifer into a jealous, petty, archangel. He claimed that he was better than the humans, and started a war in Heaven. God cast him down to the Earth, like he did with the enemy gods. God then sent the Grigori down to guard Eden from Lucifer. The Grigori were given special swords that were able to kill archangels, so that they could protect the humans from Lucifer. The leader of the Grigori, Gadreel, was placed at the entrance to Eden. Lucifer convinced Gadreel that was wanted to help humanity, and tricked him into letting him in. Lucifer went up to a human woman named Lilith, and used used the darkness within the mark to turn her into a demon. (Side note: the reason demons are black smoke is that Lucifer used the darkness within the mark (which is black smoke), and twisted Lilith into a similar entity.) He then took out his blade, and started to slaughter the humans. The Grigori saw what he was doing, and were inspired. They fled from their post, and started kill the humans in the Garden. Michael put a stop to this, and killed nearly every Grigori, though few escaped. He sent Lucifer out of the Garden, and the remaining two humans, Adam and Eve, were forced to leave as well. Gadreel was put in Heavens jail for letting Lucifer into the Garden, but since Lucifer was once Gods favorite Angel, he spared him, and let him free one more time. Adam and Eve had two sons named Cain and Abel. When the boys were older, in their teens, Lucifer wanted to transfer the mark to Abel, to let it corrupt him. Cain would rather sacrifice himself than let his brother become a monster, so he offered the deal to kill Abel. Lucifer gave Cain the Mark, which released darkness into him. Lucifer thought that with the mark on his arm, Cain would be corrupt enough to kill his brother easily. When Cain said he still could not do it, Lucifer crafted something that would help him murder his brother. He took the jawbone blade that Cain had, and painted blood sigils around the handle. When combined with the mark, these sigils would strengthen the link between the Darkness and the host of the Mark. So when the bearer of the Mark holds this blade, darkness will slowly seep into the bearer, and will power this blade to kill anything. He gave the blade to Cain, and he used it to slaughter his brother. Seeing at what Lucifer had done, God had Michael cast him into his own cage in Hell. The darkness that seeped through the Mark eventually twisted Cain into a murderer, and then into a demon. He was able to make more demons using this darkness, and so he did.

Sorry it was so long, but I had to put everything in there.