No, probably not because he creates the impression of having a bias.
He does have a "bias". It is more than an impression. Whether the bias is intellectualy justified or not is another question.
He shot himself in the foot in that regard. His targeted audience doesn't trust him.
A fair point with regard to actual full scale creationists. What about his other audience and stated intent of equipping those who know creationists with the tools to counter their anti-evo arguments?
Francis Collins would be a much more likely candidate because he shares their same faith, yet robustly defends science.
With regard to challenging creationists I think you are spot on. Dawkins, in my view, doesn't stand a snowman in hells chance of changing the mind of any creationist because the only reason they will read his books is to know what they are against (which is progress not to be neglected given the woeful ignorance of many anti-evolutionists).
However given that 40% of Americans (figure from the book under discussion) believe in creationism of one sort or another there are perhaps many who simply cite what they have been raised to believe without too much thought who might be swayed by such a book. And there may also be a large minority of potential readers who can reach even more of those who are part of that 40%.