In my world view the expression 'intrinsic value' or 'objective value' are both contradictions in terms. An object only has value in the eyes of the one giving it value (perhaps as dictated by others who see it as such). This is the way I understand the world to be. I would like it to be full of things with real value and objective moral norms, but really I think they do not exist, and while I think imagined ones are handy for a functioning society, I think they are ultimately illusory.
The only way therefor to get around this is to coat the whole of the world with a new cloak, namely 'God'. Since God had an idea for the universe, it came from him and his purposes are it's ultimate goal, therefor things derive an ultimate value in this respect.
But I do not believe that there is a God, so this is just a nice hypothesis to me, nothing more. It does grate me slightly that senior church figures in the UK, for example, can try to find common ground with secularists over ethical issues, whereas in fact, they cannot even 'sit down together at the same chess table' as Coppleston would put it.
As for the other point: I would say that Dawkins is a scientist, not a preacher or political ideologist. I say this to strengthen his standpoint, not to offer mitigation of it. This is because science states what it discovers irrespective of the political or ideological ramifications thereof.
"The truth will set you free'. If he states the truth and someone takes those facts and builds a stupid ideology around them, that's their problem, not Dawkins'.