Sorry, I kind of came late into this discussion, but there are a couple of points I wanted to make.
Critias said:
Science has never observed an ape-type ancestor evolve into a man. There is not one recorded event ever found to ever testify of such a thing.
Well, since scienctists theorize that the change from our ape-like ancestor happened over a long period of time, many 10's of 1000's of years ago, I doubt we would have been able to observe it happening in real time. Surely you must be aware of this, so you must be trying to make some other point...would you care to clarify it?
Critias said:
All sciences does is makes assumptions upon assumptions that concludes that it is basically a fact, but a theory.
Science observes, tests, and quantifies what we see all around us. You can trivialize it by saying it's just making "assumptions upon assumptions", but these same techniques have successfully wiped out diseases, landed men on the moon, decoded the human genome, and built the better mousetrap. Scientists have developed these techniques over many centuries to best figure out how the world works. It is not a perfect system, but we are merely imperfect humans, so what do you expect? And, yes, we are able to conclude that certain concepts can be considered "basically a fact", but there have been plenty of times that theories have been tweaked, or completely thrown out, when new evidence is uncovered. No scientist worth his salt will ever say that they are done looking for information or that any scientific matter is 100% settled.
For what it's worth, Creationism starts with a single assumption, that the story of Genesis is literally true, and tries to force everything else to be in line with that assumption, regardless of whether it fits or not. How is this any better of a way to gain knowledge of the world around us?
Critias said:
A rat that shares 92% of our DNA. It must also be a close relative of the human species, right?
You were obviously trying to be facetious, but you are more correct than you think. Why do you think scientists use rats in so many experiments? Things that are bad for rats are generally bad for humans as well, so a whole range of medical treatments can be tested on rats and, if found to be effective, can often be carried over into human subjects. It is precisely because rats are physiologically similar to humans that this is possible. This is obviously the same reason that monkies and apes are used. You don't see scientists testing vaccines on lizards or fish, do you?
Also, keep in mind that although certain apes share roughly 98% of our DNA with humans, that 2% is huge...somehow, whatever is in that 2% is what has given us speech, vastly superior intelligence, the ability to form civilizations, etc. If a mere 2% difference can be that huge, how big is an 8% difference?