Emotionally abusive Dad

I’m at work and will keep this short. Basically my dad has emotionally abused my mom and really all of us for years, but she gets the most of it. Horrible things are said. We‘ve actually called the police twice over the years. Last night he had an explosive outrage, not the first, and I’ve had enough. I’m a 27F, still live with my parents but if my mom and I escape we could pull our income together and make it. How do I convince her to leave? I hate seeing him hurt her like this, I utterly hate it. Worst thing is that he is supposed to be a Christian, I’m a true Christian tho and this kind of repeated sinful behaviour doesn’t reflect a repentant heart. Please help, we’ve dealt with so much trash, and this has been a pattern in other marriages in my family. I don’t even want to ever get married or have another relationship.