Are all atheists this ill-informed about religion?

[Rhondazvous]

D:
Wha...?

You said there was light,

Yep. We're not told what the source of the light was, but it was there. Assuming it was full spectrum, there was also heat. When I was young I knew a guy who grew pot plants in the space under the steps of his mom's home. They never got light from the sun but did just fine.

and plants can live one day without light.

Yep. Take a plant and put it in total darkness for 24 hours. It will survive. So, even without the first argument, this position fails.

Neither of those two statements mean a plant could live on an earth that has never had a sun.

Uh, yeah, either one of them works. You can test it yourself.

One day without sunlight because it's cloudy is not the same as one day with no sun at all,

Again, you can easily test this yourself.

and one day without sun now is still not the same as one day without there ever having been a sun.

What's the difference?

How can it be tested? By growing an oak tree on a planet that doesn't evolve around a sun?

Your whole argument depends on a condition that does not exist.