The most common question i personally get when i'm trying to explain evolution is "If we come from chimps, how come chimps aren't having humans now???!!". There's nothing wrong with asking that, if you sincerely don't know evolution, but, if you are trying to dismiss evolution, that kind of question is just proof to the case that you have no idea what evolution really is, and that you are probably basing your position towards it (evolution) on what other anti evolutionists have told you.
Human beings do not come from chimps, we are cousins, not brothers. Just like tigers are not giving birth to lions or to siamese cats, chimps don't give birth to humans because we are only related to them, we are part of the great apes. A couple of million years ago, we shared a common ancestor, and what that means is that at some point in time, before humans and chimps, there was a different, primitive ape whose descendents divided into two branches, one eventually led to modern chimps, and the other became us, human beings.
Evolution opponents claim there isn't any evidence to prove evolution, that there aren't any transitional fossils, that is in fact, a lie, theres not only enough evidence of all of this on the fossil record, but we also have DNA testing and it shows a 99% match with the DNA of a chimpanzee, and that "little" 1% difference, is all of what we have and they don't, every invention, every creation, all of our buildings, our society, our trendy gadgets, computers, video games, music, movies, paintings, books, blogs and forums. All of that is included in that mere 1% difference. What do you think would happen if the aliens came, and they had that same 1% difference from us?.
Sadly, trying to do research on these type of things on the internet seems harder and harder every day, a mere search for "similar DNA betweet humans and apes" will throw you a bunch of results on pseudo scientific christian sites such as "answers in genesis" or "creationscience" all of those are places that are not driven by the interest of discovering anything or doing real research, their only interest is bashing accepted science into the ground by using their own Jesus loving "experts" and their so called creation science, you know, the same kind of science that makes them think the world is around 6000 years old. That trend has to change, like the recent poll on this very site, the internet, and the easy access to information we don't get in school or at home is what has driven most of us towards skepticism and incredulity, and we have to make sure it stays that way for future generations.