[quote name='SatchmoKhan']Chunk,
To quote myself "Evolution can be defined as change over time."
You may say that definition is way too broad to be useful, but you are not considering it in the same context as biologists do. Evolution, by that definition, is treated as the fundamental basis and unifying theory of biology, and a fundamental idea for understanding all science.
A more appropriate comparison than gravity / physics is to compare evolution's place in biology to the role of plate tectonics in geology, which is taught in basic science classes. All geological studies can ultimately be traced to the processes of plate tectonics.
You may not say that is the same, but Lyell's "Principles of Geology" was a primary inspiration for Lamarck and later Darwin's thinking on evolution. The idea that small changes over long periods of time could result in the geography and structure of the continents inspired biologists to consider the effects of small changes over time in biological systems. That is where the theory of natural selection comes in, Darwin thought: if things in nature vary (which they do), those variations are passed on to offspring (which they are), and some variations are more successful in surviving than others (which they are) then you can have evolution occuring by "natural selection".
You also say that the effects of gravity are much clearer than evolution, I would have to disagree. On the small scale of objects falling to the ground gravity is easy to understand. How it results in the movement and interactions of planets and stars and how it works on the subatomic level, that is much less clear and much more difficult to grasp.
Evolution is the same. The small scale evolution seen in bacteria and viruses evolving resistance to drugs, changes in genes and morphologies (height, lengths of parts of animals), and the effects of selective breeding by humans are very clear when presented to anyone. The origin of new species and complex structures (like complex eyes, which by the way evolved at least 3 times independently) are more difficult for most people to grasp. But that does not mean it shouldn't be taught.
Like my first post said, evolution and religion are not mutually exclusive ideas. Leaving evolution out of the (science) classroom would be a travesty, hindering the thinking of future generations.
Sorry about the long post, hard to stop once I get going

[/QUOTE]
No reason to be sorry about the long post. I appreciate your well thought responses. Most of the jokers around here don't take anything seriously.
Anyway, I still think that that definition is too broad, even in the context of biology. Somebody else gave the same definition in another thread to which I replied: "then my beard evolves every morning".

See what I mean? Perhaps you could comment.
Regarding natural selection, things do vary in nature, but not all kinds of biological variations are passed on to offspring (for example, my beard, my education, or my bad tooth). So the important variations may not be inheritable in all circumstances. In fact, it could be that in many situations the most important variations are not inheritable. Furthermore, the potential to evolve doesn't necessarily mean that something could evolve indefinitely. In other words, there could be limitations. To give an analogy, just because I can walk in baby steps that doesn't mean that I can walk out of a prison cell.
Also, I think you have misunderstood what I meant by "clear". I did not mean easy to understand or easy to see. When I said clear I meant testable and proveable. Gravity on planets, stars, and on the subatomic level can be measured very accurately and in many cases with controlled experiments. Evolution, while it may be a temping explanation in many circumstances, is much more difficult to prove by means of controlled experiment. Therefore, the veracity of the theory is not as clear because the proof is not as strong.
Regarding evolution in the classroom, I'm not necessarily opposed to it being taught, but I don't like how it is presented on equal footing with other theories which are much better established. It is sometimes said that the biological sciences are about 100 years behind the physical sciences and by not emphasizing that in the classroom a lower standard for scientific proof is impressed on the students which will hinder further scientific development of scientific rigour (both in the biological sciences and elsewhere).
I have a whole list of unanswered questions regarding evolution, actually. I'm curious what you will say to them. Will you address them if I post them here or if I PM them to you?