@ CharonY:
This isn't so much about debunking his argument - it basically does that all by itself. The reason I post this here is twofold: First, to warn everyone of the type of "thinking" that still exists today. Second, this guy has stated several times that science and scientists do not support evolution, and I just thought it would be funny to link the guy to a page full of scientists giving scientific reasons why he's talking crap.
@ Strange
Yeah, it is more of a buffet... don't read the whole thing, just pick a quote or two and refute the hell out of it . I actually linked him to peer-reviewed articles including one of the famous fruit fly experiments which clearly states that "All these strains mate freely with Orinocan, but show a pronounced, though incomplete, ethological isolation from strains of the Interior semispecies.". Which is exactly the evidence he asked for, but would he listen? Hah! Would he buffalo.