However, there are those who believe - and Dawkins tends this way - than any religious belief is tantamount to fanaticism.

I think you are misrepresenting him. Dawkins knows full well that the overwhelming majority of believers follow their faith (if they do any sort of active "following" at all) in a most desultory manner. Fanaticism implies single-minded ardour and passion in propagating your beliefs. That is not the way most believers behave.

They will say, for example, that they have no objection to a person having any belief as long as they keep it to themselves, and in particular do not inflict it on their children.

I'm not at all clear as to how this is meant to support your first statement. I do agree with it in spite of that. In fact, I'd go further: your beliefs are none of my business, unless you choose to make them my business. Damaging children should be seen as everyone's business.