The primordial water covered world in Gen 1:2 (Tehom/Tiamat) collided with Marduk and his "wind(s)" (the same term is used to describe God's spirit hovering above the face of the deep) at what is now the asteroid belt.
As a result of those collisions the firmament called Heaven was created - the hammered out bracelet (asteroid belt) - and Tehom/Tiamat was pushed into an orbit closer to the sun with a new spin or rotation (the creation of day and night).
The water of Tehom was divided or separated by the asteroid belt with Tehom taking some water with it closer to the sun while another batch of water remained at and beyond the asteroid belt (snow line).
That was followed by the waters below the firmament being gathered together to form Seas thereby revealing the dry land. When the Earth (dry land) appeared on the 3rd day it had a new sky which is described on the 4th day.
There are multiple gods named in the enuma elish, Apsu (sun), his companion Mummu (Mercury), and Tiamat. Three pairs of gods followed, in their midst were born Lahmu and Lahamu (the warrior twins Venus and Mars) followed by another pair beyond Tiamat, Kishar (Jupiter) and Anshar (Saturn).
The last pair were Anu and Nudimmud/Ea... One last God, Gaga (Pluto?) was sent by Anshar (Saturn) to the other gods to announce Marduk's supremacy as he accepted the challenge to battle Tiamat. Marduk was clothed with the halo of 10 gods.
If Apsu had been the sun, the Enuma Elish would probably be closer to accepted reality than we have thought. Utu is the sun, and is a third generation part of the solar system, although in the scheme of things, Genesis says that the sun started to shine on day 4.
Today it is accepted that the sun was accreting along with the rest of the planets, and the Enuma Elish explained it closer than Genesis does, but I guess it would depend on changing what people thought the Enuma Elish says. I guess they don't think the ancients knew what they were talking about. I don't think that Sitchin was totally correct either. Some claim that Apsu was the primordial fresh water, and Tiamat was the salty water. As pointed out they used to think that the universe was a gigantic ocean.
Here is my take:
Apsu and God represent the universe itself.
Tiamat is the chaos happening during the formation of the Solar System. She represents the birth pangs of the accretion process.
As the sun is forming and starting to shine and attracting the planetary bodies, it starts out well, but there was some confusion in where exactly all the planetary bodies would end up. Un-technically the universe (Apsu/God) about to step in and take over management of the chaos/Tiamat, forced her to take matters into her own hand and sent for help from outside the solar system. This enraged the already forming planets so they crafted their own chaos and the planet earth was sent as a warning shot. This covert planet was called Marduk.
There were two collisions (the splitting of the last chaos into two parts) to finish and bring peace to the solar system. The first one resulted in the Asteroid belt, and the last one was when the earth collided at it's final spot in the planetary order, and the creation of the moon.
Why is Marduk the actual earth? That represented the actual struggle between chaos/Tiamat, and Marduk. He was the hero, because in sacrificing, and splitting his internal chaos into two parts, he brought peace to the solar system. Tiamat can never be a planet, she only represents the planets in a chaotic accreting act of formation. The whole of the solar system was changing from chaos into planets in a regular orbit.
The earth never has a given god title. There is no planet other than the earth that would fill in as the god Marduk. I realize that planets do not have minds of their own, but it goes back to a physical body with a spiritual component. Also the earth as the "center" was pictured as Marduk surrounded by the planets and the sun.
Somehow there was a planet that was further out, and because of that had more water, than heavier metals for land formation. In the process of arrangement and accretion, it did get nudged or pulled closer into the sun. It hit a planet on it's way in, forming the asteroid belt. It ended up in it's current place after being stopped by a planet which allowed the formation of the moon. Marduk was able to use winds like a rocket propulsion system and propel himself/earth into position.
I don't think the point should be they got it wrong. They had a story that in their own vernacular explained an event that a being actually told them about. At that point in history why would they even think that the earth had more water than would be normal for a planet in that orbit to have. They would have had to have knowledge of the water content on all the planets to even know that the earth had a higher proportion of water, to even start to come up with an explanation.
They more than likely were not around when it happened. In the evolutionary scheme of things, they would have had to retain that information for -4 billion years (time frame given by modern standards) It could have happened recently in known history, but I think that has been vetoed by the -4 billion time frame. I am open to suggestions how they even had the sense to claim what happened when modern humans with their technology cannot prove nor accept that the earth came from a position further out. I think that it would have been cool though to be living on the earth when that happened. Other than the last collision with the moon, which would have left an indelible memory on a lot of people groups around the planet.
There are two main ideas. There are aliens with such knowledge who visited and told them. The other is that there is a spiritual dimension that has at one time had the ability of two way communication with humans. The act of giving the planets, god names, and teaching that these gods had minds of their own that could influence the very physical aspect of nature, would be proof.
Aliens may have universe movement cycles that only bring them around at certain points in time, so that is almost un-provable, unless they visit again, and survive any incidents involving government cover-ups. Although how a race of beings smart enough to traverse the universe, cannot get past the government is beyond me. That may be part of letting all the common folk sit in the "Dark Ages" instead of knowing the truth.
The other idea which there seems to be a strong support for all over the planet, involves a link to another dimension and we call it the spiritual world.
How close the Bible sticks to the narrative has already been stated that the Hebrews left out all the god stuff, because they were told to not mention other gods, but only name God as part of the process. Why are names so important as to not be used in vain? For some reason names seemed to be able to invoke some kind of connection with the "other side".
According to Genesis the sun was created after Earth.
Not necessarily, it was there , just not shining yet. "Made" may not mean "create", but "forced" the sun into completing it's accretion.
That doesn't follow at all - if only because Genesis reveals no knowledge of an asteroid belt.
There are no planets mentioned at all. The Hebrews were to have "no other gods".
Again, this is not what was said at all. To repeat the example, an artist creating a painting doesn't use new materials, but existing ones. It doesn't follow the artists didn't create anything - to the contrary.
You view God as an artist. They viewed God as an aloof universe. The solar system did form out of the universe. Some just said that it was on "it's" own, and there are no beings capable of controlling things from another dimension.
I'd like to point out that there's a water planet in the universe. It's not formless, even though its submerged land isn't dry. I hope that clarifies things for you.
It would seem that the word accretion, may not have been a concept for them. They described it as "rowdy kids on a playground".