My dad called me the devil, what do I do?

SuperNovaRoyalty
So in my church I help at the Sunday school there. Some of the kids are really rude to my little sister, and she keeps giving them back rude little comments. This had been happening for a while, so I decided to tell my parents and the kids' parents what was happening...
I'm almost certain that those kids (who are also family friends) are going to get beat. So anyways, my mum told my dad a twisted version of the story in the car to him, and then he went off.
Usually when I go to my parents, I expect them to keep their cool, not hurt anyone's feelings, and solve the problem/ help me think things through. But my dad started to really destroy our self-esteem. He said that my sister would never have any friends and that she'd be a loner, and he said that all of this was my fault and that I'm the devil (this isn't the first time he's said this). He keeps bringing me down constantly, and blaming his parenting failures on me. And I'm a good kid- straight A's, I work hard, I try to be the best in my class which is what he always wants me to be.
And on top of this, he said that if I teach my sister bad things, he is going to beat me again. The last time I got beaten was at least a year ago, and I had bruises on my body. My sister got hit by my mum last week and she pinched her inner thighs and there were dark brown marks on her, and she was screaming. All I did was try to help my sister to stop getting bullied in Sunday school, but my dad thought that I was trying to get her in trouble. I just can't believe that my dad said that to me. In his culture, if you are said to be possessed by an evil spirit, that's really bad, and his specific words were "You try and make yourself look like an angel, but you're not, you're the devil." I started crying after he said that, and I'm afraid that he will beat me really hard. And not to mention, the holidays are coming up, and then I'll have to spend more time with my parents. This is why I keep my distance. So what do I do now?
My dad called me the devil, what do I do?
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