I need advice from ex Muslims

So basically I am in a relationship with a muslim girl who has been fed lies that women are above in islam

( Islam is the most feminine religion of all time)

I am not a muslim myself I am someone who was exposed to ex muslims first who left islam because they say how shitty religion it was

And i might get into a very big argument with her in future

What I am thinking is that I'll shut my mouth when she is talking about islam that's the best option in my mind

I don't hate muslims but i hate islam