I can't say I agree.
First of all it is not simply similarity of DNA of different species that's evidence of evolution, but
how DNA shows similarity. If we map the similarities in DNA between species we get something called a nested hierarchy. This is a mapping specifically predicted by the theory of evolution.
Note that there exists no suggested reason why this should be the case except for evolution.
Creationists can, at best, suggest that "god wanted to make it so", but that's hardly a prediction, since any possibly observation could be countered with that statement.
Interestingly, if we do the same type of mapping using other methods (for instance similarities in morphology), or by looking at fossils, we get not just a nested hierarchy again, but the
same nested hierarchy.
Different methods of showing how we're related point to the
same relatedness (again, we're not simply talking about similarities here, but patterns/mappings of similarity). There's no reason for this to be so if the relatedness isn't actually there.
The point about similarities in organs of pigs is a silly one. We use pigs hearts for transplants, for instance, simply because they're similar
enough to us, and have the appropriate size.
Even if chimp hearts were the appropriate size we wouldn't use them. They're a bit harder to come by you see.
