Islam and rape

I get mad when someone say islam doesn't allow rape. I wish it didn't but while lots of women have to live with this fact they exactly deny our reality. Last night my dad literally flipped out because he couldn't rape my mom. He beated her and told even allah gives me the right to do it how can you refuse it. I know martial rape is not exclusive to muslims but if my mom wasn't a muslim she would clearly know she did nothing bad and it would make her feel less terrible. I am extremely sad i can't help her. I fuckin hate my dad and that religion gives him right to do.