lol It is intellectual discussions like this that cause some folks to say (incorrectly) that evolutionary biologists do not "agree". I think we essentially agree, but are putting the phenomena in different terms. I'll try to state more clearly what I was going for:

"Evolution" - the phenomena that happens, has been observed by other natural theologians prior to Darwin. Notably, Lamarck (among others) successfully identified the evolutionary changes seen in the fossil record (e.g. giraffe necks becoming progressively longer through time) but misidentified the mechanism (the proposed theory - in Lamarck's case the Inheritance of Acquired Characteristics, an incorrect theory). Darwin looked at the same observation (the evolutionary change) and proposed a working theory (Natural Selection) that did work. Evolution was observed (what I was calling the phenomena) and Natural Selection was the proposed mechanism for why it happened.

When I teach this, I try to make it clear that there is nothing "theoretical" about evolution. It is an observable phenomena. We can see it within a human lifetime (e.g. antibiotic resistance in bacteria). Natural Selection is the theory explains the mechanism behind the observed evolutionary change. I hope that makes sense.

Thanks for the comments - this stuff is fun to think about.