He thinks religion is a dangerous delusion, that over the millennia has caused immeasurable strife and suffering and he wants to try and limit that cause and effect in the future. Furthermore he thinks that religious belief and faith, i.e. belief in something despite evidence to the contrary, impinges on scientific progress in a society. For example, despite overwhelming evidence to the positive, global climate change is still called into question with religious zealotry and this continued questioning will cause our society major problems in the next 50 to 100 years. Religious belief requires a mode of knowledge accumulation that allows for ignoring data that opposes a preconcieved conclusion and that mode of learning has tremendous capacity to be harmful to society. So, Dawkins, the so called pussy, is trying to save society from it's own delusions that he thinks are extremely dangerous, that's why he writes fucking books.