memes

In a vacuum you're right, but the dialectical way of analyzing things is the opposite of just evaluating them on face value as if they existed in a vacuum. If you take a country that's been through hell and back because of colonialism, who has been subject to a western collaborating fascist regime under the Shah, and were brought out of that period of nihilistic, proto-liberal subjugation by the Islamic Revolution, the negation of Islam must necessarily be a historical force that is similarly positive and brings a distinct form. The purely negative aspect of irreligiosity can't be a force of history by itself, it only becomes one when combined with some other positive agenda in the context of Iranian society.

Now if I had to guess why a lot of us are viscerally skeptical and critical of such a thing is that atheism in West Asia is almost always associated to the West now that communism is much weaker in the region. Arab nationalism (obviously a bit outside of the Iranian context now) can be secular but it is very different from the form of Western-style atheism that sets Islam as its target.