Is it diversity to hire a creationist to teach evolution?

Yes. Being a creationist wouldn't preclude someone from making correct and valuable critiques of evolutionary theory. You can be wrong about elements of a field but still make valuable contributions to it.

Earlier somewhere in here, we talked about Christopher Hitchens defending David Irving, a holocaust denier. I pointed out that Hitchens described him as "probably one of the 3 or 4 necessary historians of the Third Reich".

Creationism is a real and interesting problem. Last I heard, Ventner is creating life one base pair at a time. He's written water marks into the dna of his creatures. He's making it easy to see the design, but in general, how would one tell the difference between an evolved creature and an "intelligently designed" one? How would we tell the difference between some intelligently designed panspermia dna and dna that naturally evolved? I don't know. But I'd like someone to take a real stab at the problem.