But there are lots of religious people who are aware of the existence of such atheists, yet who do not follow all the most stringent cultural practices of their religion.

Right, but that predicate wasn't the only one that applied here. This religionist:

-is adamant about spreader her views to the point she wishes to know what stops people from joining
-is aware of the different arguments against and classifies them
-most importantly, is in a theocracy of like-believers that gets government enforcement of its tenets

That's quite different from a random Jew ignoring an orthodox sect's bizarre prohibitions.