Photons can emit light but with no sun or starts just how much light do you think there would be? Ever go out at night? Come on man...you're really stretching here.
You assume that the universe was always the same mean temperature as it is now (about 3 degrees Kelvin or about 250 degrees below zero), it hasn't always been that way. Shortly after creation and for millions of years afterwards, the mean temperature of the universe was measured in millions, billions and trillions of degrees. So in such an environment, photons would be produced in abundance.
As for the plant life do you really think that they were referring only to fungi and deep oceanic plant life? I doubt they even knew what that was at the time.
The point is that not all plant life requires light. Your first comment was that plants could not exist because there wasn't any light. I offered some examples to disprove your statement.
You say after the last ice age the mean sea level rose by 400 feet. That's pretty cute. The Bible is inconsistent with this on several levels.
1. The bible claims that the earth didn't even exist before the last ice age. It was allegedly created about 4 thousand years later.
That depends on the meaning of the word "day". From my understanding, the ancient Hebrew word for "day" can also mean "age". Even English uses the word "day" to mean era e.g. "in the day of King Solomon".
2. Let's pretend that 1. isn't true. 400 feet is very high but let's not forget the Bible says that the waters covered the highest mountain with room to spare. Mount everest is somewhere around 29,000 feet above sea level if I'm not mistaken. That's not even close.
You say the story has roots in historical reality. There is some truth to a flood but it was a local river flood according to historians. It was NOT a global flood as depicted in the bible. So like I said it's at least an exaggeration.
No, the end of the last ice age brought about flooding on a global scale. The mean sea level increased by 400 feet, which means that it happened all over the world. As a result, most if not all ancient cultures have a flood account.
You say that saying the bible is not factual is just plain wrong. It may be partially factual but that doesn't make it factual.
Let's say for the sake of argument that Genesis is all a bunch of hocum. Does that make the 10 commandments a bunch of crap too? Perhaps we should all commit adultery, kill, lie and steal just because Noah never existed. That would be called "the end of civilization"....
BTW... all religions are full of crap, if Christianity is. Do you believe that Buddha sat under a Banyan Tree for months at a time without moving? That Mohammed was suddenly taken up to heaven? How about the belief in reincarnation? On the other hand, atheism has done a lot for us, especially as exercised by the Communists, who with no fear of God to stop them, murdered over 100 million people during the course of the last century.
As a wise person once said... "if God didn't exist, it would be necessary for Man to invent Him"