The Problem with Christians

[AJW333]

So in the human eye, the optic nerve joins the retinal cells to the neurons in the back of the brain (in multiple separate nuclei). What function did each of these structures perform before they were all connected to each other?

You are aware that the evolution of the eye predates even the brain, yes? The optic nerve evolved from nerve fibers attached to a light sensitive patch of cells that had been present from an extremely early organism. The retina was the back of those same cells, at the point at which they had cupped to form a pinhole camera for better directional "vision." All this is firmly present in the link that you've sworn up and down you've read.

I don't see where the article talks about the function of the optic nerve in a single celled organism with a light patch and no brain. I would also like to know how the millions of neurons that are spread out in multiple nuclei in humans came to exist.

The definition of science,

"Science is a systematic enterprise that creates, builds and organizes knowledge in the form of testable explanations and predictions about the universe." https://en.wikipedia.org/wiki/Science

The developments from light patch to fully formed eye are presented as fact and yet no one observed these changes when they are alleged to have happened, and unless I am mistaken, there are no tests proving that all of these developments happened as reported. There are still organisms alive today with light patches/eyespots so how do we know absolutely that these became the eye? Isn't it all just speculation?

I will respond to the rest of this post later.