Race is a social construct, but it's not an ideology, it's not a choice. Nobody chooses to be classified as white or black by society; being Muslim is a choice just like being a Marxist. Being black or white, while mostly meaningless from a genetic POV, is an innate characteristic of people over which they have no power. Failing to realize this key difference is beyond ridiculous.Actually, only idiots (which covers anti-SJW warriors almost entirely) think that race is prima facie a special category and that any thesis about race is wrong simply because it's about race. Their thinking is not sophisticated enough to realise that the fundamental problem is not exclusive to race. They can maybe get as far as the concept of race being a social construct and therefore any attempt at a blanket analysis is going to come up with fiction. But that begs the question: If race is a social construct, religion is not?
But the most salient criticism of a blanket analysis of a major religion is that it's bound to represent the entire religion monolithically from one particular angle. And the result would be as silly as saying things like "Black people are less intelligent." The picture painted would be manifestly inaccurate as it purports to be complete but is actually incomplete. Even if your blanket analysis covers 80℅ of the religion, it's still problematic to attribute your observations to something fundamental to the faith, since obviously that doesn't apply to a significant segment of the faithful. And the evidence seems to bear this out too: The OP's comments on liberal Muslims clearly show that his exposure to more liberal strands of Islam is limited.
Of course there are huge differences within Islam, but they all follow a Prophet who was also a warlord and conqueror. They all follow a Prophet who personally ordered massacres, and even killed people himself. That is a sharp contrast to Jesus, who is followed by Christians of all varieties, and it matters. This is obvious I should not have to point out, but everything must be pointed out to SJWs who live in their parallel universe. This has nothing to do with being black or white. There is no major unifying characteristic of those groups other than skin tone (which is quite varied too).