this girl keeps bullying me

so I'm in 9th grade and in my class I have 2 friends, we are a triangle, but one out if these two friends keeps pushing me out and bullying me so she can get closer to the other one. she tried to change my religion and convince half of my class that I wasn't christian like wtf. she also took credit for my assignment and told her group of friends that I called her in the middle of the night and screamed at her. this resulted in her friends fighting with my friends. my friends won due to the fact that they are strong punchers 😂 but I don't know what to do.