Atheist here. The only Dawkins book I’ve read is The God Delusion. Didn’t care for it. Don’t have a copy, as I borrowed it, so I can’t recreate in detail why I didn’t like it. Also, this was about two years ago. A few points I remember.
One, I didn’t like the ad hominem nature of the work, starting with the title. As far as I’m concerned, describing the opposition as deluded is a cheap shot. It’s also assuming the conclusion. If you’re setting out, as Dawkins claims in the preface, to change the minds of religious people, cheap shots and assuming the conclusion are pretty good ways to make sure you don’t achieve your objective.
Two, the treatment of faith based on scripture struck me as facile. Basically, on what arguably is the key issue, all he does is lay out some of the Bible scholarship on how we know the New Testament isn’t literally true. Fair enough and something a lot of lay Christians don’t realize. But it’s scarcely fatal. The Q hypothesis dates back to the 19th century. Thinking theologians have been getting over this hurdle for a long time. Not engaging the issue at that level greatly weakened the book, IMHO.
Three, I found disingenuous the discussion of why religious belief seems to be adaptive, as it’s nearly universal. As I recall, Dawkins ends up plumping for a theory that it’s a misfiring of an adaptive trait of children accepting without critical thinking what they’re told by parents and other elders to believe, like not swimming in the river or they’ll be eaten by crocodiles. So, again an ad hominem. With little basis in reality (has Dawkins really never spent any time around children?). And no relevence to why religion appeals to adults. To my mind, it’s a classic example of pulling a theory out of thin air to suit ones agenda, something good scientists don’t do.
Mind, these are only three examples and I may have mangled them a bit in detail, as I’m going from memory, but I ran into stuff like this throughout the book. At the time, as a mental exercise, I did a mock debate in front of a hypothetical Christian audience and trounced him. I also did one in front of a hypothetical atheist audience, where he won easily. IOW, it works as an atheist apologetic, but I don’t have much use for apologetics from either side. What I would like to see is a book which makes the case to the opposition. The God Delusion isn’t that book.