dorayakii,
To start off the discussion, for me point 6 is the easiest to refute... As an historical linguist, i'm well familiar with the fact that as ancient languages developed from "simple animal sounds" they became more and more complex.
OK let me play with this statement a bit from the creationist's perspective. What do you mean you are familiar with "the fact"? What you have presentend is a mere assertion. Where is the evidence? As a historical linguist you have to have access to real evidence when drawing your conclusions. When saying: Old English used to have four cases for nouns, you point to Beowulf (for the sake of the argument) and other texts to prove it. When saying "the fact that as ancient languages developed from "simple animal sounds" they became more and more complex", what is the evidence you point to?
Modern languages seem simpler to us but in reality they are much more complex. Most ancient languages had to use more complex word orders and constructions to represent tense and aspect whereas modern languages for the most part integrate them into their grammar. Therein lies the conundrum. In real terms, this modern method is more complex, because it relies on tacit knowledge of the precise meaning and connotation of auxiliaries and may even require some additional cultural knowledge.
Yeah I see the point about the tacit complexity with all the undelying dead metaphors etc. However, in all fairness, I am not sure how you measure complexity. I guess if we want to be fair about the complexity of ancient and modern languages, then we'd have to admit that they are just differently complex. Can you name a single well-documented ancient language which lacked the kind of polysemy and 'tacity' (What's the English word anyway) which you say is so unique for modern languages?
I once had this discussion with FunkyDerek and he actually argued that the cultural evolution of languages (as investigated by historical linguists) has little to do with biological evolution. I guess I agree with him. IMHO, with all due respect which I have for historical linguistics (as a computational linguist myself) I have to say diachronic evidence recorded in manuscripts is irrelevant for the theory of evolution.
Your turn :-).
Pole