While I agree what RMS said was incorrect, let's recast CPLX's arguments into the Middle Ages and see what happens:

> Our culture has made a very bright line decision that being an atheist is unacceptable. Expressing doubt about this cultural norm, or especially advocating against it, is considered unacceptable. Of course one can argue with the merits of those two facts, but they are plainly true and fairly widely accepted.... While I appreciate the efforts to make this into some kind of principled argument, I don't find "first they came for the people advocating for not believing in God" to be particularly compelling."

Does the problem become clear now? (Substitute abolitionism, suffragism, civil rights, etc. for atheism if you like.) Ironically, much like the conservatives they oppose, progressives are arguing that it is acceptable to crucify people who say something that is agains the status quo and tradition.