Sorry for the late reply. Time pressures, you know. (Not that you mind anyway.

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I don't contradict myself, I just state what is in the Bible. (paraphrasing) It says a day and a thousand years are the same with the Lord. so 1 day = 1000 years. Numbers are in order, 1, 2, 3, 4, 5, 6, 7. Hence sequential.
And again your suggesting that heaven and earth were created prior to day 1, is unbiblical. There is no day 0.
Your argument is reading like this::
On Day 0, prior to creating the heavens and the earth, God created the heavens and the earth.
and all the elements that were used in creation, were made prior to them being made.
On Day 1, he uses said elements in a big chili pot and stirs pot, and sets them in motion.
I am saying:
There is no Day 0. Nothing is created prior to it being created. No water, no earth, no heavens.
There is no pre-Genesis where he is creating the earth and waters and heavens.
On Day 1, he creates the heavens and the earth, and all the elements thereof, and begins his work.
There is a reason why it is not said "Let there be light" until Genesis 1:3.
"Let there be light" was not the first creative act. God does not need to tell you how he did it, but he does divulge the fact that he did, and that it occurred on Day 1.
If it happened on a "Day 0", then that would be "Day 1" wouldn't it? And creation would have been 8 days and not 7. The days are relative to creation itself.
This line of thinking would bring you to conclude, that there is a Day -1, Day -2, Day -3, Day -4, etc. When it clearly shows in Scriptures with the evening/morning cycle that evening and morning are how the days are defined. Thus a day does not have 15 evenings. It only has one. There are not 366 mornings in one day. There is just one. There would be no evening and morning of day 0. Therefore, no day 0.
Here is what it comes down to:
You presume that the waters in Genesis 1:2 existed PRIOR to Genesis 1:1. Unsupported by scriptures. Day 0.
I gather that the waters in Genesis 1:2 were made DURING Genesis 1:1. Supported by Scriptures. Day 1.
Thus our impasse.