Mikey, your question includes segments of the questions usually assigned to "creationists" and you are to be commended for asking in a reasonable manner.
Of course the Grand Canyon is a humbling sight. Of course it's millions of years old. Of course the universe is between 14 and 15 billions of years old and the solar system, including Earth is around 4.8 billion years old. End of.
It's never been my attempt to, as naomi accuses "...to disprove evolution..." however, there are important aspects of the Theory that, when viewed suscpicioulsy, add new dimensions to the correlation between it and Creation as described thoroughly in Scripture.
It's speculation on Jim360's part to ascribe changes in "species" to "... "It's natural to expect that it will be hard to define a distinct species if species are constantly changing and adapting, such that the edges are going to be blurred", when, in fact species arise in the fossil record fully formed, remain that way for a greater or shorter time period and disappear. The documentation in reference to this phenomenon is not religiously based.
I attended a western U.S. university whose Department of Geology is well know and respected and was taught and studied material attesting to those facts. My Professor wrote one of the course books that's still referenced today... "Rocky Mountain Geology". I highly recommend it (among others).
Paleontologist Stephen Jay Gould admitted: "The absence of fossil evidence for intermediary stages between major transitions in organic design, indeed our inability, even in our imagination, to construct functional intermediates in many cases, has been a persistent and nagging problem for gradualistic accounts of evolution." (Source: Paleobiology, 1980).
Birdie, I did not invent the source as you suggest, however, if you'd care (or anyone else) to Google the opening lines of your second paragraph, you'll find a source of exactly your entire quote... but a word of warning... the source is under a website listed as ".php" which is often an adward site and can cause some problems if not handled correctly. Why that is, I don't know.
OG... it's more than just quibbling... if you'd care to read some of the documentation you'd find just how deep and wide the rift is. Point is, if one can't define "species" how can one determine anything about descent from one to the other or establishment of a new species?
It's puzzling that when one attempts to include pertinent source material (always of non-religious sources) one is accused of not understanding the material only to have the accusers fail to include such sources for their own arguments. Birdie says of course he/she has read her own links, yet fails to understand what the links are saying.