@Ghost_in_the_system, you are correct, life had to start somewhere. Evidence suggests it started in the oceans, in primitive cell-like lipid bilayer membranes. (Lipids, when mixed with water, spontaneously form cell-sized enclosing bubbles. These can even divide in a process similar to cell division under certain conditions).
Like many religious people, you completely misunderstand the Big Bang Theory. It’s not:
1:00. Nothing.
2:00. Nothing.
3:00. Nothing.
3:34. BOOM! Big bang occurs.
There was no time before the Big Bang. Space and time are the same fabric. To put it another way, time is finite, but boundless—there is no “edge” to it. In the same way the surface of the earth has a finite area, but there isn’t any “edge” or “boundary.” The north pole on the earth is the northernmost point, but you don’t fall off the earth if you go past it. Similarly, the Big Bang is the “earliest” point in the universe, but it’s not an edge. Stephen Hawking talks about this at length in A Brief History of Time.
Even if Yahweh was creating in slowed-down days, he still is described as having created stuff in the wrong order. We know, for example, that the sun came into existence before the earth. And that day and night do not even make sense as concepts without a sun. (Of course, for a bronze-age nomad adapting Mesopotamian mythology, this conception might make sense.)
And you have a bizarre standard for “saying that Yahweh doesn’t exist.” Can’t you make the same argument for people claiming Ahura Mazda doesn’t exist? Do I really need to have all the answers to the Universe’s mysteries before declaring that Zeus and Thor are made-up mythological characters? Again, this is the “God of the gaps” argument. You think you can prove God’s existence by pointing to the (shrinking) realm of phenomena not yet explained by science and assuming he lives in there. It’s just weird.