Others have picked up on the 'religious system' comment, which is so back to front I'm smiling. But I think this is worth comment, too.
She's basically calling contemporary GC feminists Serena Joys.
Yes, I'm sure she is, which is absolutely astounding considering that in the Handmaids Tale, the oppression of women is not based on their lack of freedom to define themselves. It's based on their biology.
The religious aspect of this issue is people believing in invisible gendered souls that can find themselves in any body at all, and the religious control aspect is the movement which campaigns for medical surgical intervention on non conforming children, access to sex specific space for certain men to validate their 'female soul' with cries of bigot to objections, and language manipulation so that women are prevented from speaking about their oppression.
If anyone is Serena Joy in this scenario, it's Butler.