How so? Dawkins is claiming that those that believe in God are wrong. It’s up to him to prove it. As far as I can tell, he is the one that made the accusation against the believers. The believes did not single Dawkins out and charge him with being a non-believer.
Dawkins sounded pretty senile when Ben Stein interviewed him. He was talking about the possibility that aliens planted basic single-celled organisms on Earth.