My point is that the bible does not say God made the universe in six days.
Gen 1:1 says God made the Universe
But Gen 1:2-2:3 speaks specifically about this earth and the two great lights made on day 4... Life on Earth and our sun and moon.
Therefore in Genesis 3 when Satan shows up already the devil already having been cast out of heaven - already the leader of 1/3 of the fallen angels - it is because there is a lot of pre-history there.
The earth is already covered with water before day 1.
So while the Genesis account does inform us about all life on Earth - it is not saying a whole lot about all the other stuff in the Universe and how it is that before day 1 there is already Earth covered by water, and before day 1 of Earth's creation week - there is already a devil.
I do not follow you...how can you positively conclude that there is already a devil before earth's creation week.
In the beginning there is only God...all else is void. Job 38:7 tells us the angels shouted for joy at the creation of the earth...far as I know that is all the information we are given about the creation of the angels.
Here is the explanation of Lucifer's fall:
Isaiah 14:12-14:
2 How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations!
13 For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north:
14 I will ascend above the heights of the clouds; I will be like the most High.
The Bible mentions the fall of many angels to join in Satan's rebellion, and I don't remember where that is recorded the best and I don't have time to look that up right now. I do not from memory believe that it directly coincides with Satan's fall. We do have the fact that they fell recorded.
About Satan tempting Adam and Eve...it is not recorded as to how much time elapsed with them living in the garden before their fall. One could so some calculations with Adams lifespan and Adam's age at the birth of Cain to see how old he was at that point in time...still would not give you any accuracy.
Futile and foolish to try to find out and entirely unnecessary.