In this thread? Yes, of course it is ad hominem to refer to his political views to slight his comments about this book which is about evolution, not politics. Do you deny that was your intention?
My post about his politics was written to correct the mistaken impression of another poster that Dawkins is a "liberal."
He is an anti-American leftwinger, willing to put his name to a viciously anti-American document which was also signed by playwright Harold Pinter, one of the most extreme America hating leftwingers on the planet.
Dawkins' religion --- the "blind pitiless indifference" of evolution --- very much informs his politics, which in turn very much informs the hate that runs through the so-called "review" at the top of this thread.