Thus, staying back on track, what would you say is the best counter argument to Dawkins' interpretation of God's behaviour as reported in the OT? Ideally, something that is available online.
That's hard to say. My problem with the whole question is that it's effectively a debate between Christian literalists, for whom the entire Old Testament is fully historical, and atheistic literalists, who have an identical interpretation. And then the debate degrades into one side arguing that genocide can be permissible, and the other side losing it entirely.
I'm relatively conservative in the way I approach the New Testament, but liberal about the Old Testament, so I usually avoid talking about it around here in order to avoid ruffling feathers. My thoughts on the matter, though:
1) The Old Testament is the story of a people that lived in the Bronze Age. It is violent, but so was their world, since they constantly faced warfare and conquest. I honestly find it absolutely fascinating, because it is so old and alien, so I always find it frustrating when the different themes that come up over and over again are reduced to, "God is evil." It is so much richer than that!
2) I
think you posted a little bit earlier that Dawkins was permitted to treat the God of the Old Testament as a fictional character and describe his characterization from that perspective, but my objection would be that Dawkins doesn't even have his literary genre correct. To me, what we see in the Old Testament is more an impressionistic painting of what God looks like by numerous different authors over centuries, not a single, well defined character. Christians would need to look to the Gospel to finally get a portrait of God's character--before that, I really do think it's just whispers and themes.
My other concern with treating God as a fictional character would be that even if this were fiction, the subject matter is deeply theological and difficult. Since you've outed yourself as another Tolkien fan, I will use that as an example: I have an atheistic friend who is a fan of the Silmarillion, who thinks that Ilúvatar is... well, a word that is probably censored here. Ilúvatar is a fictional character, but Ilúvatar is also the Creator God of a fictional world full of Catholic themes, so I look at my friend's statement and think... really? We would need to unravel the exact same theological problems in our fictional world as we do in the real one, so it's just not so simple.
Hmm. I don't know if that answers your question, and I can't really give a solid counter-argument since I'm not all that sure what Dawkins' argument is in the first place.