It is generally dangerous to engage in the works of non-Muslims who are specifically attacking our religion or one of the basics upon which our religion can never ever compromise. This is more true in this day and age, when even those Muslims who have been born and bred for decades in an Islamic society may still not know some of the basic tenets on Islamic Aqeedah. However, if you have proper knowledge of Islamic Aqeedah and want to read the book only for the purpose of throughly refuting it, then it may be good to order it and read it. As far as I know, the only vociferous voices against Dawkins are generally christians, and their arguments are as flimsy as the atheist ones.