"Sorry--silly argument. "This cannot be because it's complicated and we can't explain everything yet. It therefore must be divine." Nihilistic and illogical."
Actually the argument is that "this exhibits qualities of designed things. Therefore, it is a reasonable inference that it was designed."
Evolutionary biology is trying to exclude design a priori, based simply on the fact that if universal common ancestry is true, then design is incorrect. I find it odd that, given that we are not infinitely intelligent beings, that some members of biology think that everyone has to follow the same lines of research.
This whole argument smells of Acts 19:23-29 to me.
Well, that's weak too. Anything that works would appear to be designed. Ultimately, it still ascribes "design" and "outside intelligence" to things we cannot as yet understand.