Evolution within species is a valid theory, there is much archeological evidence to suggest this happened.
We are talking about evolution, not animal husbandry. Evolution is specifically something evolving from one species to another.
What you seem to think, that evolution is responsible for cross-genus (species) evolution, is not valid because nothing in science has ever shown that to be the case. It is as whimsical as believing in a God.
I like how you try to pair up something nutty (evolution does not exist) with something logical (God does not exist), equating them so that you can seem more moderate than you really are, when you really don't care about the moderate thing (no God) and any belief in the nutty thing (no evolution) nullifies any sanity any way.
ID science examines the complexity of individual components. The human eye, for example, the human ear is another. These components are comprised of several parts, which independently do nothing, and would serve absolutely no function whatsoever. It is only as a complete component, they are of any value. Therefore, according to Darwin himself, it is impossible for these components to have evolved. Science can't explain this, but you have assumed evolution explains it without any basis... that's called "faith."
Dixie, Darwin famously devoted an entire chapter in "The Descent of Man" proving how an eye could have evolved. You are claiming he argued something that is the opposite of what he actually argued. You are referring to an out of context quote by Darwin:
http://www.talkorigins.org/faqs/ce/3/part8.html
"To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest degree."
This is often quoted by Christian loons to make Darwin look like he disagreed with his theory. However, that's statement is followed with:
"To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of Spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest degree. When it was first said that the sun stood still and the world turned round, the common sense of mankind declared the doctrine false; but the old saying of Vox populi, vox Dei ["the voice of the people = the voice of God "], as every philosopher knows, cannot be trusted in science. Reason tells me, that if numerous gradations from a simple and imperfect eye to one complex and perfect can be shown to exist, each grade being useful to its possessor, as is certain the case; if further, the eye ever varies and the variations be inherited, as is likewise certainly the case; and if such variations should be useful to any animal under changing conditions of life, then the difficulty of believing that a perfect and complex eye could be formed by natural selection, should not be considered as subversive of the theory."
That makes a lot more sense now doesn't it? The first sentence is merely a rhetorical tool, something that he rips apart in the proceeding sentences, and isn't meant to be taken alone.
He then proceeds to use the entire next chapter to explain how an things like eyes developed. He never argued that it was impossible for them to evolve. That is absurd - he would've been saying that his own theory that he was trying to prove with this book was impossible.
http://en.wikipedia.org/wiki/The_descent_of_man#Apparently_non-adaptive_features
"Apparently non adaptive features" means "irreducible complexity", and Darwin ripped the argument a new one in "The Descent of Man".