You folks are talking about speciation and it most certainly has occurred and been observed many, many times.
http://phys.org/news/2013-10-evolution-species-requires-genetic.html
http://www.talkorigins.org/faqs/faq-speciation.html
Perhaps what you are having trouble getting your mind around, is evolution occurs in a small step-wise progression toward a best-fit of the current environment. We won't see short-term dramatic changes in an organism, nor should we expect to. It is a statistical process.
The accumulation over time of many small changes combined with (as one example, there are others) geographic isolation has produced many new species. This is what Darwin observed and wrote about during his visit to the Galapagos. Modern tools such as gene sequencing have only served to confirm the validity of the theory.
Nothing in any field of scientific inquiry contravenes the theory of evolution: Archaeology, biology, anthropology, genetics and so on. If anyone were to do so, they would win the Nobel prize, so creationists -- have at it. Good luck with that.
To deny the reality of evolution and the common descent of organisms is be willfully ignorant. Google is your friend. Getting your layman's science view from a pastor is ill-advised as they tend to be just as ignorant as their flock.
Talk origins refutes most every objection to evolution presented in this thread and many more objections yet to be raised.
http://www.talkorigins.org/indexcc/list.html
The irony of the creationist claiming "there is no proof!" is particularly rich, given there is no evidence for any of the supernatural claims of any religion nor major swaths of their respective foundational "holy" books. Books containing tales replete with the walking dead, talking animals, the sun going dark, the Exodus myth, Mohamed riding his flying horse-thingy to Jerusalem and back and on and on.
This thread is depressing.