A very common misconception. You're confusing neoDarwinian evolution with natural selection. Darwinian evolution teaches that one species evolved into an entirely different species. What neoDarwinian evolution teaches is that, for example, a monkey evolved into a human.
This would involve new genetic information being written which cannot happen. Your example of immunity does not account for this, because even those people who passed immunities to their parents ARE STILL HUMANS. They didn't become a NEW SPECIES. Can a human breed with an ape and produce a new species? Even if it could happen, this still is different from Darwinian evolution, which teaches that as a particular species of horse needed to reach the higher leaves on the trees, it stretched its neck and over millions of years giraffes evolved - which is absurd.
You're wrong about the DNA changes. I'd suggest you do a little study on the matter. It is a scientific FACT that DNA mutations always involve a loss of information, not a gain.
..... Do you have any idea how much time I spend on genetics? I would equate this to suggesting to you that you don't know what the 10 commandments are. (let's take our differing interpretations of the bible aside) Before you presume to lecture me on DNA, genetics and evolution, I would suggest you do a little study on the matter, and not the study that results from reading creationist stories and bastardizations of these matters. Try some real scientific study, then you can argue with me the problems with evolution vs intelligent design, because there are places where evolution seems like a stretch, or requires faith to fill in the blanks, but you are nowhere near touching on them.
New genetic information can happen.... Take the example of the moths. Mutations do NOT always involve a loss of information. Evolution just means CHANGE not gain, it is the process of adaptation to an environment, and it does not imply the creation of a separate species. However, eventually as a species becomes separated from their ancestors, and the difference in genetic information becomes too great, they become unable to interbreed. There are no scientific facts that say mutations in genes always result in a LOSS of information. Mutations in genes usually means a dormant gene will become active. We carry a TON of genetic information that our we do not use. A prime example would be those people that are born with fur. I know you have heard of or seen them before on television. They didn't just create a fur gene. A gene that had become dormant simply reactivated.
Now, gaining a genetic immunity to disease..... HOW is that not evolution? Those people evolved to cope with an environment. Evolution, once again, does not mean new species. To say otherwise is a mischaracterization of evolution. Then again, I suppose it is rather convenient to your side to simply state that it is not evolution. Very well then, what do you call the process in which those people were able to adapt to an environment with new diseases, then pass this
new information on to their children, and have children born with immunity to this disease? Not to sound condescending, but, did God come down from heaven, give their genetics new information since we, his imperfect designs, have no mechanism for storing this new information in our genetic code on our own? Why didn't god just create us with the ability to adapt and evolve in our environment?
The giraffe.... a favorite of creationists.
Well, let's take Darwin's explanation, since most people just make assumptions based upon what they learned when they visited the zoo at 6 or what they can observe immediately:
"...the individuals which were the highest browsers and were able, during [droughts], to reach even an inch or two above the others, will often have been preserved.... By this process long-continued... combined no doubt in a most important manner with the inherited effects of increased use of parts, it seems to me almost certain that any ordinary hoofed quadruped might be converted into a giraffe."
What is most likely, is that a Giraffe's neck extended as their legs did, since their legs are unable to support their weight if they bend at the knees. They evolved longer legs so they could see farther and run faster. Therefore, the ones with longer legs could outlive the shorter legged ones in their area, meaning they could mate more. This lead to increasing the dominance of the gene that causes growth in their neck. Those ones who were taller also were able to reach higher into foliage to eat, therefore they had less competition for food. The taller ones could also reach further to get water, where as shorter ones would have had to venture further into the mud around drying ponds, and would have been more likely to sink, become stuck, and die. This does not mean giraffes went hungry or thirsty for millions of years. This just means that the tallest among the group were least likely to go hungry or thirsty, therefore reproduced in greater numbers. If you combined the two explanations I gave, you have a perfectly reasonable explanation to the long neck of the giraffe, and one that in a way, could even be a natural phenomenon in an area that was sparsely vegetated and drought prone like african savanna.
....
Now.
Evolution means CHANGE. Generally a change to adapt to an environment. Nothing more. Nothing less. To try and stick to out of context information, creationist semantics, and wrong information passed around to argue against evolution is silly. At this point however, you are nowhere NEAR how DNA functions.