It's partially in the work of Dr. Francis Crick, one of the co-discoverers of the DNA strand (you'll like him; he's an athiest, too).
According to the Theory of Evolution, all modern everything on earth evolved to their current, super-complex forms from progressively simpler and simpler forms going all the way back to the beginning of life on earth. If you believe this to be a fundamental Truth, then it would be no surprise to you to know that the DNA strand... all of them, in every single animal and plant on earth... has the genetic code of every other animal and plant on earth.
In other words,
our DNA possesses the genetic material for feathers, scales, retractable claws, breathing underwater, echo location, etc. Everything. The DNA in an ant has within it the genetic material of all of that , too. All the DNA on earth has all the traits necessary to rebuild an entire earth flora/fauna menagerie. Since everything on earth evolved from the simplest, single-celled organism, according to the Theory of Evolution, this should not be a surprise.
The problem is that the earliest found traces of earth DNA are the exact same. And so is the DNA within an actual single-celled organism. And so was the DNA found on the organisms that stowed away on the Martian meteorite several years ago and crashed here.
The very first DNA on this planet, had all the genetic code for all the animals and plants that would
EVER BE ON EARTH IN THE FUTURE!!!Let that sh*t sink in before you respond.

I missed this reply, so I'll reply to it now.
#1 I did some quick research on Francis Crick, he was an atheist like you said, and he absolutely accepted evolution and advocated it being taught in schools. So, if according to you he was the discoverer of such a huge flaw in evolution, why did he still accept it and advocate it so fiercely?
#2 You are correct that a lot of species contain the genes for producing organs that are not used by those species. For example humans can produce tails, birds have genes that can produce claws and teeth, etc. However, these genes only exist because the species have had those organs in the past. The ancestors of humans had tails, and birds are evolved from avian dinosaurs. Humans have never had wings, and they DON'T have any genes for producing wings.
#3 We have the specific fossils which show the evolution of certain organs, for example the evolution of the forelimbs of dinosaurs into wings. This proves that these organs were not present from the start, they evolved through time.
#4 About this claim:
"
The problem is that the earliest found traces of earth DNA are the exact same. And so is the DNA within an actual single-celled organism."
This is obviously false, because even the DNA of one human being is different from that of another human being. If a human and a bacteria had identical DNA as you seem to be implying, then there would be no difference between a human and a bacteria, we would
be like bacteria or bacteria would
be us!
#5 Can you show me any credible sources which say that the earliest found DNA had the genes for producing tails, wings, feathers, brains, and all traits found in modern species, or even that humans have genes for wings? Keep in mind that only qualified biologists' opinion bears
any importance. If the person making these claims is not a biologist, then this is nothing more than the opinions of any layman who can make any claims he wants without providing evidence for them.