I know the work. I've read a good deal of it, though not all. I agree with most of what I have read. But none of it is new. And Dawkins has his off moments as well, where his thinking is not as clear as it might be. But don't we all?
Certainly religion has proven to be dangerous in the past. Particularly when it comes to atheists. Did you know that there are at least 5 countries where atheists are still executed if they are discovered?
We just have to look at fundamentalist Islam these days to see the danger religion can pose for those who disagree with it. But it isn't just religion that is dangerous. Any idea that pits us against each other or excludes people, like nationalism for example, can become dangerous. Need we remind anyone of the second world war to prove that point?
Dawkins also wrote about memes in one of his books. I think it was The Selfish Gene, if I remember correctly.
In that book he makes the case that religion is like a virus: the mandate to pass it on, it's effects on the person infected, etc. But then many ideas are memes, not just religion. In fact I could make a case for many ideas being viral in nature. Some are beneficial and some very dangerous.
I think Dawkins idea of militant atheism could be dangerous if it got out of hand and turned into a fundamentalist meme.