I agree that Dawkins stepped beyond his boundary of expertise with his book The God Delusion, but if we're going to argue for the importance of context when it comes to discussion of mythologies/religions then we have to understand the context within which Dawkins was writing at the time. Mindless literal interpretation of the Christian bible was on a huge upswing, with bigots and racists and mysogenists all thumping their copies and claiming this mashup of earlier myths justified whatever fundamentalist stance happened to be theirs. Unreason was resuming its sway over millions of empty-headed ordinary people. Like Voltaire, Dawkins clearly saw that belief in primitive fairytales is ultimately a recipe for disaster and felt compelled to do his bit in standing against the tide. The fact his book isn't actually very good is lamentable, but we can at least understand his impulse. And he was ultimately correct: as Voltaire noted, people who can be persuaded to believe in nonsense can readily be persuaded to commit atrocities.