Oh, the similarities to fundamentalist Islam are absolutely warranted, I just wanted to address the incorrect claim that Atwood wrote Handmain about Iran or Islam (which is false).

Of course all fundamentalist oppressive branches of religions, be it Christianity, Islam, Judaism or whatever, converge to similar shapes.

Atwood was worried about trends in the US and imagined a world where the earliest conservative Puritan Christianity -- that she considers a foundational part of America -- made a comeback. So no "gender equality". The early Puritans didn't behave "like Islam", any similarities are a result of a convergent evolution of sorts; their sins are entirely their own: fundamentalist Christianity. Atwood said much, that these were faults of the West she was describing.

I'm all for Death of the Author, but the specific claim I refuted was about what Handmaid was intended to be about (not other valid interpretations) and only the author can answer that. And she did!