Firstly, not in my experience. Most criticism of Islam I come across is... criticism of Islam. Secondly, that's three races which kind of illustrates the point we're all making.
Here's a simple test we can apply. Take someone you stereotype as racist. That can be me if you like Strider - I'm nationalist, I'm mildly right-wing, White and I'm highly critical of Islam. I even believe Tommy Robinson has a point (oh no!). I'm exactly the sort of person you would and have dismissed as racist. Now, having found or imagined such a person, ask them who is going to upset them most - an ordinary, British-sounding, Westernised person who shares your values but happens to be non-White. Or a White convert to Islam who believes zealously in Islam, has changed their garb to some sort of "Islamic" fashion and goes on about Infidels all the time? I guarantee you every time that the "racist" will be more hostile to the latter. Every. Time.
I've had numerous friends from Islamic backgrounds. It was their fathers I had a problem with, who didn't want their daughters hanging around with us and picking up Western values. The difference isn't race because they share that. Now you make this oft-repeated claim that criticism of Islam is a fig-leaf for racism "usually". I don't think it is. And no matter how many times that assertion is repeated, it's not the usual case I see. Ditto with criticism of Israel usually being... criticism of Israel. Can you point at people who do use it as a fig-leaf? Sure - I've known a few of them as well. But to assert as you do that this is the majority of cases, and further to use that assertion as an argument to shut down criticism of Islam generally which is what this document tries to do - no, enough of that! You only exclude yourself from reasonable discussion further by holding to it.