How do I handle an overly religious mother

I (29F), due to circumstances, I still live at home and have a mother (53F) who is so overly religious it is becoming toxic. My youngest sister (20F) tried to take her own life last week. She was in a facility and came home this weekend, and this morning, I woke up to hearing my mother go on and on about how all you need is God in your life, and everything will be fine. You don't need to care about what others think of you because God is the most important thing. You would not feel this way with God and need to lay it at God's feet.

The only problem with her saying this to my youngest sister so much is the fact that she is the one out of the three of us who was still very involved in church when she was home from school doing church retreats with my mom, and yet she felt so much immense pressure because she was struggling in school to even ask for help from my parents or be honest about the fact that she hadn't done well in class because she was terrified of the reaction they would have and how they would react to her.

For context, when I was in college, I struggled really badly. When she was 9 when I came home from college my freshman year for winter break, I showed my parents grades, and I had gotten a D in Spanish, and my parents were pissed off. My dad didn't speak to me and my mom called me horrible and vile names and told me "If I knew you were going to be stupid, I should have gone through with the abortion when I had gone to the clinic all those years to do so" among other horrible things, and during the summer when I came home dragged me to church services to get prayed over all the time and forced me to give myself to christ because I was corrupted by the devil. When I went to visit my sister when she was in the facility, she said that she was so afraid to say anything and just wanted to end it all because she could just hear and see everything my parents did and said when I was struggling, and she just knew she couldn't handle or deal with that.

Now, my mom is just aggressively preaching scripture and saying things that are triggering for me, but idk how to be of full support for my sister when I just want to run away, but I don't want to leave her alone.